[MM-56904] Reduce the number of api requests made to fetch user information for GMs on page load (#27149)

* use new endpoint to fetch group members

server/channels/app/server.go

@@ -41,6 +41,7 @@ import (
 	"github.com/mattermost/mattermost/server/v8/channels/jobs"
 	"github.com/mattermost/mattermost/server/v8/channels/jobs/active_users"
 	"github.com/mattermost/mattermost/server/v8/channels/jobs/cleanup_desktop_tokens"
+	"github.com/mattermost/mattermost/server/v8/channels/jobs/delete_dms_preferences_migration"
 	"github.com/mattermost/mattermost/server/v8/channels/jobs/delete_empty_drafts_migration"
 	"github.com/mattermost/mattermost/server/v8/channels/jobs/delete_orphan_drafts_migration"
 	"github.com/mattermost/mattermost/server/v8/channels/jobs/expirynotify"
@@ -1603,6 +1604,11 @@ func (s *Server) initJobs() {
 		nil,
 	)
 
+	s.Jobs.RegisterJobType(
+		model.JobTypeDeleteDmsPreferencesMigration,
+		delete_dms_preferences_migration.MakeWorker(s.Jobs, s.Store(), New(ServerConnector(s.Channels()))),
+		nil)
+
 	s.platform.Jobs = s.Jobs
 }