MM-27688-OpenId Connect (#16222)

* implement openid connect

* update error strings

* handle OpenIdSetting.Secret as FAKE SETTING

* add openid to telemetry

* update config defaults, add telemetry

* fix bug with Office365

* Retrieve Office365 AuthData from IdToken

* fix linter

* add feature flag, reset defaults for config

* fix build error

* fix unit tests

* add authentication permission to Feature
Flags

* turn off feature flag

* set default button color

* set default button color only on openid

* fix for merging FeatureFlags in config

* remove feature flag

* revert config changes

* remove debug statements

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/switch_request.go

@@ -34,14 +34,16 @@ func (o *SwitchRequest) EmailToOAuth() bool {
 		(o.NewService == USER_AUTH_SERVICE_SAML ||
 			o.NewService == USER_AUTH_SERVICE_GITLAB ||
 			o.NewService == SERVICE_GOOGLE ||
-			o.NewService == SERVICE_OFFICE365)
+			o.NewService == SERVICE_OFFICE365 ||
+			o.NewService == SERVICE_OPENID)
 }
 
 func (o *SwitchRequest) OAuthToEmail() bool {
 	return (o.CurrentService == USER_AUTH_SERVICE_SAML ||
 		o.CurrentService == USER_AUTH_SERVICE_GITLAB ||
 		o.CurrentService == SERVICE_GOOGLE ||
-		o.CurrentService == SERVICE_OFFICE365) && o.NewService == USER_AUTH_SERVICE_EMAIL
+		o.CurrentService == SERVICE_OFFICE365 ||
+		o.CurrentService == SERVICE_OPENID) && o.NewService == USER_AUTH_SERVICE_EMAIL
 }
 
 func (o *SwitchRequest) EmailToLdap() bool {