chore(CI): retry on quota exceeded (terraform-google-modules#1847)

Author: apeabody

test/integration/testutils/retry.go

@@ -18,5 +18,8 @@ var (
 RetryableTransientErrors = map[string]string{
 // Error code 409 for concurrent policy changes.
 ".*Error 409.*There were concurrent policy changes.*": "Concurrent policy changes.",
+
+// API Rate limit exceeded errors can be retried.
+".*rateLimitExceeded.*": "Rate limit exceeded.",
 }
 )