[depot_tools] Raise GS check_call err

Raise exception returned by GS when downloading

Bug: b/336509491
Change-Id: Iacd47f83cda07dcb55f9e904a606048cb844aedd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5484130
Reviewed-by: Joanna Wang <jojwang@chromium.org>
Commit-Queue: Stephanie Kim <kimstephanie@google.com>

gclient.py

@@ -2694,7 +2694,9 @@ class GcsDependency(Dependency):
         else:
             gsutil = download_from_google_storage.Gsutil(
                 download_from_google_storage.GSUTIL_DEFAULT_PATH)
-            gsutil.check_call('cp', self.url, output_file)
+            code, _, err = gsutil.check_call('cp', self.url, output_file)
+            if code and err:
+                raise Exception(f'{code}: {err}')
             # Check that something actually downloaded into the path
             if not os.path.exists(output_file):
                 raise Exception(f'Nothing was downloaded into {output_file}')