MM-12976: Moving MFA to Team edition (#9971)

* MM-12976: Moving MFA to Team edition

* Changing the mfa disabled i18n key and string

app/enterprise.go

@@ -95,12 +95,6 @@ func RegisterMetricsInterface(f func(*App) einterfaces.MetricsInterface) {
 	metricsInterface = f
 }
 
-var mfaInterface func(*App) einterfaces.MfaInterface
-
-func RegisterMfaInterface(f func(*App) einterfaces.MfaInterface) {
-	mfaInterface = f
-}
-
 var samlInterface func(*App) einterfaces.SamlInterface
 
 func RegisterSamlInterface(f func(*App) einterfaces.SamlInterface) {
@@ -131,9 +125,6 @@ func (s *Server) initEnterprise() {
 	if metricsInterface != nil {
 		s.Metrics = metricsInterface(s.FakeApp())
 	}
-	if mfaInterface != nil {
-		s.Mfa = mfaInterface(s.FakeApp())
-	}
 	if samlInterface != nil {
 		s.Saml = samlInterface(s.FakeApp())
 		s.AddConfigListener(func(_, cfg *model.Config) {