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/client.go

@@ -288,6 +288,9 @@ func GenerateLimitedClientConfig(c *model.Config, telemetryID string, license *m
 	props["SamlLoginButtonTextColor"] = ""
 	props["EnableSignUpWithGoogle"] = "false"
 	props["EnableSignUpWithOffice365"] = "false"
+	props["EnableSignUpWithOpenId"] = "false"
+	props["OpenIdButtonText"] = ""
+	props["OpenIdButtonColor"] = ""
 	props["CWSUrl"] = ""
 	props["EnableCustomBrand"] = strconv.FormatBool(*c.TeamSettings.EnableCustomBrand)
 	props["CustomBrandText"] = *c.TeamSettings.CustomBrandText
@@ -322,6 +325,12 @@ func GenerateLimitedClientConfig(c *model.Config, telemetryID string, license *m
 			props["EnableSignUpWithOffice365"] = strconv.FormatBool(*c.Office365Settings.Enable)
 		}
 
+		if *license.Features.OpenId {
+			props["EnableSignUpWithOpenId"] = strconv.FormatBool(*c.OpenIdSettings.Enable)
+			props["OpenIdButtonColor"] = *c.OpenIdSettings.ButtonColor
+			props["OpenIdButtonText"] = *c.OpenIdSettings.ButtonText
+		}
+
 		if *license.Features.CustomTermsOfService {
 			props["EnableCustomTermsOfService"] = strconv.FormatBool(*c.SupportSettings.CustomTermsOfServiceEnabled)
 			props["CustomTermsOfServiceReAcceptancePeriod"] = strconv.FormatInt(int64(*c.SupportSettings.CustomTermsOfServiceReAcceptancePeriod), 10)