MM-15021: Adding new builtin system schema for Guests (#10601)

* MM-15021: Adding new builtin system schema for Guests

* Fixing tests

* Setting properly the permissions

* Adding guests to sampledata

* Restrict more roles updates in the app layer for guests

* Adding comment to explain that permissions migration must go at the end

* Setting the default guest role for custom scheme during migration

* Fixing import and export

* Creating scheme guest roles on migration

* Fixing tests

* Fixing tests

* Fixing tests

api4/apitestlib.go

@@ -104,8 +104,7 @@ func setupTestHelper(enterprise bool, updateConfig func(*model.Config)) *TestHel
 	web.New(th.Server, th.Server.AppOptions, th.App.Srv.Router)
 	wsapi.Init(th.App, th.App.Srv.WebSocketRouter)
 	th.App.Srv.Store.MarkSystemRanUnitTests()
-	th.App.DoAdvancedPermissionsMigration()
-	th.App.DoEmojisPermissionsMigration()
+	th.App.DoAppMigrations()
 
 	th.App.UpdateConfig(func(cfg *model.Config) { *cfg.TeamSettings.EnableOpenServer = true })