Storage: test_lifecycle_rules flakes with 529

[tseaver]

Same test run as #7384.

___________________ TestStorageBuckets.test_lifecycle_rules ____________________
self = <tests.system.TestStorageBuckets testMethod=test_lifecycle_rules>
    def test_lifecycle_rules(self):
        new_bucket_name = "w-lifcycle-rules" + unique_resource_id("-")
        self.assertRaises(
            exceptions.NotFound, Config.CLIENT.get_bucket, new_bucket_name
        )
        bucket = Config.CLIENT.bucket(new_bucket_name)
        bucket.add_lifecycle_delete_rule(age=42)
        bucket.add_lifecycle_set_storage_class_rule(
            "COLDLINE", is_live=False, matches_storage_class=["NEARLINE"]
        )
        expected_rules = [
            LifecycleRuleDelete(age=42),
            LifecycleRuleSetStorageClass(
                "COLDLINE", is_live=False, matches_storage_class=["NEARLINE"]
            ),
        ]
>       retry_429(bucket.create)(location="us")
...
        response = self._make_request(
            method=method,
            url=url,
            data=data,
            content_type=content_type,
            headers=headers,
            target_object=_target_object,
        )
        if not 200 <= response.status_code < 300:
>           raise exceptions.from_http_response(response)
E google.api_core.exceptions.TooManyRequests: 429 POST https://www.googleapis.com/storage/v1/b?project=precise-truck-742: The project exceeded the rate limit for creating and deleting buckets.