[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/migrations.go

@@ -646,6 +646,27 @@ func (s *Server) doDeleteOrphanDraftsMigration(c request.CTX) error {
 	return nil
 }
 
+func (s *Server) doDeleteDmsPreferencesMigration(c request.CTX) error {
+	// If the migration is already marked as completed, don't do it again.
+	if _, err := s.Store().System().GetByName(model.MigrationKeyDeleteDmsPreferences); err == nil {
+		return nil
+	}
+
+	jobs, err := s.Store().Job().GetAllByTypeAndStatus(c, model.JobTypeDeleteDmsPreferencesMigration, model.JobStatusPending)
+	if err != nil {
+		return fmt.Errorf("failed to get jobs by type and status: %w", err)
+	}
+	if len(jobs) > 0 {
+		return nil
+	}
+
+	if _, appErr := s.Jobs.CreateJobOnce(c, model.JobTypeDeleteDmsPreferencesMigration, nil); appErr != nil {
+		return fmt.Errorf("failed to start job for deleting dm preferences: %w", appErr)
+	}
+
+	return nil
+}
+
 func (a *App) DoAppMigrations() {
 	a.Srv().doAppMigrations()
 }
@@ -688,6 +709,7 @@ func (s *Server) doAppMigrations() {
 		{"Encode S3 Image Paths Migration", s.doCloudS3PathMigrations},
 		{"Delete Empty Drafts Migration", s.doDeleteEmptyDraftsMigration},
 		{"Delete Orphan Drafts Migration", s.doDeleteOrphanDraftsMigration},
+		{"Delete Invalid Dms Preferences Migration", s.doDeleteDmsPreferencesMigration},
 	}
 
 	c := request.EmptyContext(s.Log())

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
 }