OSF: Used model.NewPointer everywhere (#27838)

```release-note
NONE
```

server/channels/api4/post_test.go

@@ -233,7 +233,7 @@ func TestCreatePost(t *testing.T) {
 
 	t.Run("Should not be able to define the RemoteId of a post from the API", func(t *testing.T) {
 		newPost := &model.Post{
-			RemoteId:  model.NewString(model.NewId()),
+			RemoteId:  model.NewPointer(model.NewId()),
 			ChannelId: th.BasicChannel.Id,
 			Message:   "post content " + model.NewId(),
 			DeleteAt:  0,
@@ -273,7 +273,7 @@ func TestCreatePostForPriority(t *testing.T) {
 
 		post := &model.Post{ChannelId: th.BasicChannel.Id, Message: "test", Metadata: &model.PostMetadata{
 			Priority: &model.PostPriority{
-				Priority: model.NewString("urgent"),
+				Priority: model.NewPointer("urgent"),
 			},
 		}}
 
@@ -291,7 +291,7 @@ func TestCreatePostForPriority(t *testing.T) {
 
 		replyPost := &model.Post{RootId: post.Id, ChannelId: th.BasicChannel.Id, Message: "reply", Metadata: &model.PostMetadata{
 			Priority: &model.PostPriority{
-				Priority: model.NewString("urgent"),
+				Priority: model.NewPointer("urgent"),
 			},
 		}}
 		_, resp, err = client.CreatePost(context.Background(), replyPost)
@@ -305,8 +305,8 @@ func TestCreatePostForPriority(t *testing.T) {
 		//  for Acknowledment
 		p1 := &model.Post{ChannelId: th.BasicChannel.Id, Message: "test", Metadata: &model.PostMetadata{
 			Priority: &model.PostPriority{
-				Priority:     model.NewString("urgent"),
-				RequestedAck: model.NewBool(true),
+				Priority:     model.NewPointer("urgent"),
+				RequestedAck: model.NewPointer(true),
 			},
 		}}
 		_, resp, err := client.CreatePost(context.Background(), p1)
@@ -316,8 +316,8 @@ func TestCreatePostForPriority(t *testing.T) {
 		//  for Persistent Notification
 		p2 := &model.Post{ChannelId: th.BasicChannel.Id, Message: "test", Metadata: &model.PostMetadata{
 			Priority: &model.PostPriority{
-				Priority:                model.NewString("urgent"),
-				PersistentNotifications: model.NewBool(true),
+				Priority:                model.NewPointer("urgent"),
+				PersistentNotifications: model.NewPointer(true),
 			},
 		}}
 		_, resp, err = client.CreatePost(context.Background(), p2)
@@ -337,8 +337,8 @@ func TestCreatePostForPriority(t *testing.T) {
 
 		p1 := &model.Post{ChannelId: th.BasicChannel.Id, Message: "test", Metadata: &model.PostMetadata{
 			Priority: &model.PostPriority{
-				Priority:                model.NewString("urgent"),
-				PersistentNotifications: model.NewBool(true),
+				Priority:                model.NewPointer("urgent"),
+				PersistentNotifications: model.NewPointer(true),
 			},
 		}}
 		_, resp, err := client.CreatePost(context.Background(), p1)
@@ -349,8 +349,8 @@ func TestCreatePostForPriority(t *testing.T) {
 	t.Run("should return badRequest when post is not urgent for persistent notification", func(t *testing.T) {
 		p1 := &model.Post{ChannelId: th.BasicChannel.Id, Message: "test", Metadata: &model.PostMetadata{
 			Priority: &model.PostPriority{
-				Priority:                model.NewString("important"),
-				PersistentNotifications: model.NewBool(true),
+				Priority:                model.NewPointer("important"),
+				PersistentNotifications: model.NewPointer(true),
 			},
 		}}
 		_, resp, err := client.CreatePost(context.Background(), p1)
@@ -373,8 +373,8 @@ func TestCreatePostForPriority(t *testing.T) {
 
 		p1 := &model.Post{ChannelId: th.BasicChannel.Id, Message: "test", Metadata: &model.PostMetadata{
 			Priority: &model.PostPriority{
-				Priority:                model.NewString("urgent"),
-				PersistentNotifications: model.NewBool(true),
+				Priority:                model.NewPointer("urgent"),
+				PersistentNotifications: model.NewPointer(true),
 			},
 		}}
 		_, resp, err := client.CreatePost(context.Background(), p1)
@@ -385,7 +385,7 @@ func TestCreatePostForPriority(t *testing.T) {
 	t.Run("should create priority post", func(t *testing.T) {
 		p1 := &model.Post{ChannelId: th.BasicChannel.Id, Message: "test", Metadata: &model.PostMetadata{
 			Priority: &model.PostPriority{
-				Priority: model.NewString("important"),
+				Priority: model.NewPointer("important"),
 			},
 		}}
 		_, resp, err := client.CreatePost(context.Background(), p1)
@@ -396,8 +396,8 @@ func TestCreatePostForPriority(t *testing.T) {
 	t.Run("should create acknowledge post", func(t *testing.T) {
 		p1 := &model.Post{ChannelId: th.BasicChannel.Id, Message: "test", Metadata: &model.PostMetadata{
 			Priority: &model.PostPriority{
-				Priority:     model.NewString(""),
-				RequestedAck: model.NewBool(true),
+				Priority:     model.NewPointer(""),
+				RequestedAck: model.NewPointer(true),
 			},
 		}}
 		_, resp, err := client.CreatePost(context.Background(), p1)
@@ -408,9 +408,9 @@ func TestCreatePostForPriority(t *testing.T) {
 	t.Run("should create persistent notification post", func(t *testing.T) {
 		p1 := &model.Post{ChannelId: th.BasicChannel.Id, Message: "test @" + th.BasicUser2.Username, Metadata: &model.PostMetadata{
 			Priority: &model.PostPriority{
-				Priority:                model.NewString("urgent"),
-				RequestedAck:            model.NewBool(false),
-				PersistentNotifications: model.NewBool(true),
+				Priority:                model.NewPointer("urgent"),
+				RequestedAck:            model.NewPointer(false),
+				PersistentNotifications: model.NewPointer(true),
 			},
 		}}
 		_, resp, err := client.CreatePost(context.Background(), p1)
@@ -615,7 +615,7 @@ func testCreatePostWithOutgoingHook(
 		}
 
 		outGoingHookResponse := &model.OutgoingWebhookResponse{
-			Text:         model.NewString("some test text"),
+			Text:         model.NewPointer("some test text"),
 			Username:     "TestCommandServer",
 			IconURL:      "https://mattermost.com/wp-content/uploads/2022/02/icon.png",
 			Type:         "custom_as",
@@ -1532,12 +1532,12 @@ func TestPatchPost(t *testing.T) {
 	t.Run("new message, props, files, HasReactions bit", func(t *testing.T) {
 		patch := &model.PostPatch{}
 
-		patch.IsPinned = model.NewBool(false)
-		patch.Message = model.NewString("#otherhashtag other message")
+		patch.IsPinned = model.NewPointer(false)
+		patch.Message = model.NewPointer("#otherhashtag other message")
 		patch.Props = &model.StringInterface{"channel_header": "new_header"}
 		patchFileIds := model.StringArray(fileIDs) // one extra file
 		patch.FileIds = &patchFileIds
-		patch.HasReactions = model.NewBool(false)
+		patch.HasReactions = model.NewPointer(false)
 
 		rpost, _, err = client.PatchPost(context.Background(), post.Id, patch)
 		require.NoError(t, err)
@@ -1655,7 +1655,7 @@ func TestPatchPost(t *testing.T) {
 		require.NoError(t, err)
 
 		patch2 := &model.PostPatch{
-			Message: model.NewString("new message"),
+			Message: model.NewPointer("new message"),
 		}
 		_, resp, err := th.SystemAdminClient.PatchPost(context.Background(), post2.Id, patch2)
 		require.Error(t, err)
@@ -3757,7 +3757,7 @@ func TestGetEditHistoryForPost(t *testing.T) {
 
 	// update the post message
 	patch := &model.PostPatch{
-		Message: model.NewString("new message edited"),
+		Message: model.NewPointer("new message edited"),
 	}
 
 	// Patch the post
@@ -3767,7 +3767,7 @@ func TestGetEditHistoryForPost(t *testing.T) {
 
 	// update the post message again
 	patch = &model.PostPatch{
-		Message: model.NewString("new message edited again"),
+		Message: model.NewPointer("new message edited again"),
 	}
 
 	_, response2, err2 := client.PatchPost(context.Background(), rpost.Id, patch)