Add ExperimentalSidebarPreference in the config (#9013)

* Add ExperimentalSidebarPreference in the config

* Override Sidebar preference based on GroupUnread settings

* Rename to ExperimentalChannelOrganization

* Add Sidebar config in diagnostics

* Fix diagnostics for experimental_channel_organization

app/diagnostics.go

@@ -252,6 +252,7 @@ func (a *App) trackConfig() {
 		"experimental_enable_hardened_mode":                       *cfg.ServiceSettings.ExperimentalEnableHardenedMode,
 		"experimental_limit_client_config":                        *cfg.ServiceSettings.ExperimentalLimitClientConfig,
 		"enable_email_invitations":                                *cfg.ServiceSettings.EnableEmailInvitations,
+		"experimental_channel_organization":                       *cfg.ServiceSettings.ExperimentalChannelOrganization,
 	})
 
 	a.SendDiagnostic(TRACK_CONFIG_TEAM, map[string]interface{}{