OSF: Used model.NewPointer everywhere (#27838)

```release-note
NONE
```

server/channels/app/helper_test.go

@@ -370,13 +370,13 @@ type ChannelOption func(*model.Channel)
 
 func WithShared(v bool) ChannelOption {
 	return func(channel *model.Channel) {
-		channel.Shared = model.NewBool(v)
+		channel.Shared = model.NewPointer(v)
 	}
 }
 
 func WithCreateAt(v int64) ChannelOption {
 	return func(channel *model.Channel) {
-		channel.CreateAt = *model.NewInt64(v)
+		channel.CreateAt = *model.NewPointer(v)
 	}
 }
 
@@ -539,10 +539,10 @@ func (th *TestHelper) CreateGroup() *model.Group {
 	id := model.NewId()
 	group := &model.Group{
 		DisplayName: "dn_" + id,
-		Name:        model.NewString("name" + id),
+		Name:        model.NewPointer("name" + id),
 		Source:      model.GroupSourceLdap,
 		Description: "description_" + id,
-		RemoteId:    model.NewString(model.NewId()),
+		RemoteId:    model.NewPointer(model.NewId()),
 	}
 
 	var err *model.AppError