MM-27493 Shared channels (MVP) (#17301)

Remote Cluster Service
- provides ability for multiple Mattermost cluster instances to create a trusted connection with each other and exchange messages
- trusted connections are managed via slash commands (for now)
- facilitates features requiring inter-cluster communication, such as Shared Channels
Shared Channels Service
- provides ability to shared channels between one or more Mattermost cluster instances (using trusted connection)
- sharing/unsharing of channels is managed via slash commands (for now)

services/telemetry/telemetry.go

@@ -734,6 +734,7 @@ func (ts *TelemetryService) trackConfig() {
 		"cloud_billing":                      *cfg.ExperimentalSettings.CloudBilling,
 		"cloud_user_limit":                   *cfg.ExperimentalSettings.CloudUserLimit,
 		"enable_shared_channels":             *cfg.ExperimentalSettings.EnableSharedChannels,
+		"enable_remote_cluster_service":      *cfg.ExperimentalSettings.EnableRemoteClusterService && cfg.FeatureFlags.EnableRemoteClusterService,
 	})
 
 	ts.sendTelemetry(TrackConfigAnalytics, map[string]interface{}{