Channel Bookmarks: adds enable, reordering, and other fixes (MM-56286, MM-59807, MM-59808, MM-60031, MM-59872) (#28098)

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

server/public/model/feature_flags.go

@@ -70,7 +70,7 @@ func (f *FeatureFlags) SetDefaults() {
 	f.ConsumePostHook = false
 	f.CloudAnnualRenewals = false
 	f.CloudDedicatedExportUI = false
-	f.ChannelBookmarks = false
+	f.ChannelBookmarks = true
 	f.WebSocketEventScope = true
 	f.NotificationMonitoring = true
 	f.ExperimentalAuditSettingsSystemConsoleUI = false