Removed Post Priority feature flag (#23735)

* Removed post priority feature flag

* linting

* Update feature_flags.go

server/public/model/feature_flags.go

@@ -78,7 +78,6 @@ func (f *FeatureFlags) SetDefaults() {
 	f.InsightsEnabled = false
 	f.CommandPalette = false
 	f.CallsEnabled = true
-	f.PostPriority = true
 	f.PeopleProduct = false
 	f.DeprecateCloudFree = false
 	f.WysiwygEditor = false