OSF: Used model.NewPointer everywhere (#27838)

```release-note
NONE
```

server/channels/app/file_test.go

@@ -654,7 +654,7 @@ func TestComputeLastAccessibleFileTime(t *testing.T) {
 
 		cloud.Mock.On("GetCloudLimits", mock.Anything).Return(&model.ProductLimits{
 			Files: &model.FilesLimits{
-				TotalStorage: model.NewInt64(1),
+				TotalStorage: model.NewPointer(int64(1)),
 			},
 		}, nil)