Contribute/wysiwyg (#22020)

* add feature flag for WYSIWYG editor

* Empty-Commit-test

* added missing default value

* removed duplicate line

* Empty-Commit-test

Co-authored-by: Jason Frerich <jason.frerich@mattermost.com>
Co-authored-by: Mattermost Build <build@mattermost.com>

model/feature_flags.go

@@ -63,6 +63,9 @@ type FeatureFlags struct {
 
 	PostPriority bool
 
+	// Enable WYSIWYG text editor
+	WysiwygEditor bool
+
 	PeopleProduct bool
 
 	AnnualSubscription bool
@@ -101,6 +104,7 @@ func (f *FeatureFlags) SetDefaults() {
 	f.ReduceOnBoardingTaskList = false
 	f.ThreadsEverywhere = false
 	f.GlobalDrafts = true
+	f.WysiwygEditor = false
 }
 
 func (f *FeatureFlags) Plugins() map[string]string {