fix(oauth): add callback error page for google oauth flow

apps/users/services/google_oauth.py

@@ -367,6 +367,16 @@ def build_google_callback_redirect_url(flow: str) -> str:
     return f"{get_frontend_google_callback_url()}?flow={flow}"
 
 
+def build_google_callback_error_redirect_url(*, code: str, detail: str) -> str:
+    params = urlencode(
+        {
+            "error": code,
+            "error_description": detail,
+        }
+    )
+    return f"{get_frontend_google_callback_url()}?{params}"
+
+
 def find_social_account_for_profile(profile: GoogleProfile) -> UserSocialAccount | None:
     return (
         UserSocialAccount.objects.select_related("user")