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/config_test.go

@@ -1322,6 +1322,7 @@ func TestConfigSanitize(t *testing.T) {
 	*c.FileSettings.AmazonS3SecretAccessKey = "bar"
 	*c.EmailSettings.SMTPPassword = "baz"
 	*c.GitLabSettings.Secret = "bingo"
+	*c.OpenIdSettings.Secret = "secret"
 	c.SqlSettings.DataSourceReplicas = []string{"stuff"}
 	c.SqlSettings.DataSourceSearchReplicas = []string{"stuff"}
 
@@ -1332,6 +1333,7 @@ func TestConfigSanitize(t *testing.T) {
 	assert.Equal(t, FAKE_SETTING, *c.FileSettings.AmazonS3SecretAccessKey)
 	assert.Equal(t, FAKE_SETTING, *c.EmailSettings.SMTPPassword)
 	assert.Equal(t, FAKE_SETTING, *c.GitLabSettings.Secret)
+	assert.Equal(t, FAKE_SETTING, *c.OpenIdSettings.Secret)
 	assert.Equal(t, FAKE_SETTING, *c.SqlSettings.DataSource)
 	assert.Equal(t, FAKE_SETTING, *c.SqlSettings.AtRestEncryptKey)
 	assert.Equal(t, FAKE_SETTING, *c.ElasticsearchSettings.Password)