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>

config/utils_test.go

@@ -25,6 +25,7 @@ func TestDesanitize(t *testing.T) {
 	actual.FileSettings.AmazonS3SecretAccessKey = sToP("amazon_s3_secret_access_key")
 	actual.EmailSettings.SMTPPassword = sToP("smtp_password")
 	actual.GitLabSettings.Secret = sToP("secret")
+	actual.OpenIdSettings.Secret = sToP("secret")
 	actual.SqlSettings.DataSource = sToP("data_source")
 	actual.SqlSettings.AtRestEncryptKey = sToP("at_rest_encrypt_key")
 	actual.ElasticsearchSettings.Password = sToP("password")
@@ -46,6 +47,7 @@ func TestDesanitize(t *testing.T) {
 	target.FileSettings.AmazonS3SecretAccessKey = sToP(model.FAKE_SETTING)
 	target.EmailSettings.SMTPPassword = sToP(model.FAKE_SETTING)
 	target.GitLabSettings.Secret = sToP(model.FAKE_SETTING)
+	target.OpenIdSettings.Secret = sToP(model.FAKE_SETTING)
 	target.SqlSettings.DataSource = sToP(model.FAKE_SETTING)
 	target.SqlSettings.AtRestEncryptKey = sToP(model.FAKE_SETTING)
 	target.ElasticsearchSettings.Password = sToP(model.FAKE_SETTING)
@@ -66,6 +68,7 @@ func TestDesanitize(t *testing.T) {
 	assert.Equal(t, *actual.FileSettings.AmazonS3SecretAccessKey, *target.FileSettings.AmazonS3SecretAccessKey)
 	assert.Equal(t, *actual.EmailSettings.SMTPPassword, *target.EmailSettings.SMTPPassword)
 	assert.Equal(t, *actual.GitLabSettings.Secret, *target.GitLabSettings.Secret)
+	assert.Equal(t, *actual.OpenIdSettings.Secret, *target.OpenIdSettings.Secret)
 	assert.Equal(t, *actual.SqlSettings.DataSource, *target.SqlSettings.DataSource)
 	assert.Equal(t, *actual.SqlSettings.AtRestEncryptKey, *target.SqlSettings.AtRestEncryptKey)
 	assert.Equal(t, *actual.ElasticsearchSettings.Password, *target.ElasticsearchSettings.Password)