OSF: Used model.NewPointer everywhere (#27838)

```release-note
NONE
```

server/channels/app/slashcommands/command_invite_test.go

@@ -145,7 +145,7 @@ func TestInviteProvider(t *testing.T) {
 		groupChannel := th.createChannel(th.BasicTeam, model.ChannelTypePrivate)
 		_, err := th.App.AddChannelMember(th.Context, th.BasicUser.Id, groupChannel, app.ChannelMemberOpts{})
 		require.Nil(t, err)
-		groupChannel.GroupConstrained = model.NewBool(true)
+		groupChannel.GroupConstrained = model.NewPointer(true)
 		groupChannel, _ = th.App.UpdateChannel(th.Context, groupChannel)
 
 		msg := "@" + th.BasicUser2.Username + " ~" + groupChannel.Name
@@ -213,7 +213,7 @@ func TestInviteGroup(t *testing.T) {
 	th := setup(t).initBasic()
 	defer th.tearDown()
 
-	th.BasicTeam.GroupConstrained = model.NewBool(true)
+	th.BasicTeam.GroupConstrained = model.NewPointer(true)
 	var err *model.AppError
 	_, _ = th.App.AddTeamMember(th.Context, th.BasicTeam.Id, th.BasicUser.Id)
 	_, err = th.App.AddTeamMember(th.Context, th.BasicTeam.Id, th.BasicUser2.Id)
@@ -274,7 +274,7 @@ func TestUserGroups(t *testing.T) {
 	id := model.NewId()
 	teamGroup, err := th.App.CreateGroup(&model.Group{
 		DisplayName:    "dn_" + id,
-		Name:           model.NewString("name" + id),
+		Name:           model.NewPointer("name" + id),
 		Source:         model.GroupSourceCustom,
 		Description:    "description_" + id,
 		AllowReference: true,
@@ -293,7 +293,7 @@ func TestUserGroups(t *testing.T) {
 	id2 := model.NewId()
 	nonTeamGroup, err := th.App.CreateGroup(&model.Group{
 		DisplayName:    "dn_" + id2,
-		Name:           model.NewString("name" + id2),
+		Name:           model.NewPointer("name" + id2),
 		Source:         model.GroupSourceCustom,
 		Description:    "description_" + id2,
 		AllowReference: true,