MM-58823 Remove feature flag from client metrics (#27397)

server/public/model/feature_flags.go

@@ -57,8 +57,6 @@ type FeatureFlags struct {
 	NotificationMonitoring bool
 
 	ExperimentalAuditSettingsSystemConsoleUI bool
-
-	ClientMetrics bool
 }
 
 func (f *FeatureFlags) SetDefaults() {
@@ -83,7 +81,6 @@ func (f *FeatureFlags) SetDefaults() {
 	f.WebSocketEventScope = false
 	f.NotificationMonitoring = true
 	f.ExperimentalAuditSettingsSystemConsoleUI = false
-	f.ClientMetrics = false
 }
 
 // ToMap returns the feature flags as a map[string]string