Fix creation OAuth2 auth source from CLI. (#14146)

Fix #8356

models/oauth2.go

@@ -119,8 +119,18 @@ func InitOAuth2() error {
 	if err := oauth2.Init(x); err != nil {
 		return err
 	}
-	loginSources, _ := GetActiveOAuth2ProviderLoginSources()
+	return initOAuth2LoginSources()
+}
 
+// ResetOAuth2 clears existing OAuth2 providers and loads them from DB
+func ResetOAuth2() error {
+	oauth2.ClearProviders()
+	return initOAuth2LoginSources()
+}
+
+// initOAuth2LoginSources is used to load and register all active OAuth2 providers
+func initOAuth2LoginSources() error {
+	loginSources, _ := GetActiveOAuth2ProviderLoginSources()
 	for _, source := range loginSources {
 		oAuth2Config := source.OAuth2()
 		err := oauth2.RegisterProvider(source.Name, oAuth2Config.Provider, oAuth2Config.ClientID, oAuth2Config.ClientSecret, oAuth2Config.OpenIDConnectAutoDiscoveryURL, oAuth2Config.CustomURLMapping)