MM-44221: Add admin console setting to enable/disable App Bar (#20224)

* Revert "[MM-39820] Add AppBarEnabled feature flag (#18967)"

This reverts commit ba1b279c5f.

* Add EnableAppBar admin setting

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

services/telemetry/telemetry.go

@@ -718,6 +718,7 @@ func (ts *TelemetryService) trackConfig() {
 		"cloud_billing":                      *cfg.ExperimentalSettings.CloudBilling,
 		"enable_shared_channels":             *cfg.ExperimentalSettings.EnableSharedChannels,
 		"enable_remote_cluster_service":      *cfg.ExperimentalSettings.EnableRemoteClusterService && cfg.FeatureFlags.EnableRemoteClusterService,
+		"enable_app_bar":                     *cfg.ExperimentalSettings.EnableAppBar,
 	})
 
 	ts.SendTelemetry(TrackConfigAnalytics, map[string]interface{}{