Revert "Support for Embeded chat (#9129)" (#10017)

This reverts commit 3fcecd521a.

model/oauth.go

@@ -17,7 +17,6 @@ const (
 	OAUTH_ACTION_EMAIL_TO_SSO = "email_to_sso"
 	OAUTH_ACTION_SSO_TO_EMAIL = "sso_to_email"
 	OAUTH_ACTION_MOBILE       = "mobile"
-	OAUTH_ACTION_CLIENT       = "client"
 )
 
 type OAuthApp struct {