Remove Global Drafts Feature Flag (#23767)

* Remove global draft feature flag

* More removal - in progress

* Removed the rest in webapp

* Removed the rest in webapp

* Fix tests

* Update feature_flags.go

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/api4/drafts_test.go

@@ -25,7 +25,6 @@ func TestUpsertDraft(t *testing.T) {
 	defer th.TearDown()
 
 	// set config
-	th.App.UpdateConfig(func(cfg *model.Config) { cfg.FeatureFlags.GlobalDrafts = true })
 	th.App.UpdateConfig(func(cfg *model.Config) { *cfg.ServiceSettings.AllowSyncedDrafts = true })
 
 	client := th.Client
@@ -95,7 +94,6 @@ func TestGetDrafts(t *testing.T) {
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
-	th.App.UpdateConfig(func(cfg *model.Config) { cfg.FeatureFlags.GlobalDrafts = true })
 	th.App.UpdateConfig(func(cfg *model.Config) { *cfg.ServiceSettings.AllowSyncedDrafts = true })
 
 	client := th.Client
@@ -120,7 +118,6 @@ func TestGetDrafts(t *testing.T) {
 		Message:   "draft2",
 	}
 
-	th.App.UpdateConfig(func(cfg *model.Config) { cfg.FeatureFlags.GlobalDrafts = true })
 	th.App.UpdateConfig(func(cfg *model.Config) { *cfg.ServiceSettings.AllowSyncedDrafts = true })
 
 	// upsert draft1
@@ -169,7 +166,6 @@ func TestDeleteDraft(t *testing.T) {
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
-	th.App.UpdateConfig(func(cfg *model.Config) { cfg.FeatureFlags.GlobalDrafts = true })
 	th.App.UpdateConfig(func(cfg *model.Config) { *cfg.ServiceSettings.AllowSyncedDrafts = true })
 
 	client := th.Client