Storage quickstart sample is flaky

[coryan]

We can close this bug when (a) we decide that running this quickstart is not important (and stop running it), or (b) we figure out a way to eliminate the flakyness.

Running the quickstart example is flaky (see below). It creates a bucket but (for simplicity?) does not set the idempotency flag and therefore does not retry. We easily go over the bucket rate creation policy and the request fails.

---

running 4 tests
  | test storage::mocking::tests::test_upload ... ok
  | test storage::mocking::tests::test_count_lines ... ok
  | test storage::driver::quickstart ... FAILED
  | test storage::driver::run ... ok
  |  
  | failures:
  |  
  | ---- storage::driver::quickstart stdout ----
  | error cleaning up quickstart bucket rust-sdk-testing-qke5gademgkamrxqiehfutf7rl9g0bymm9ihjzrwe85veg: the service reports an error with code NOT_FOUND described as: The specified bucket does not exist.
  |  
  | Caused by:
  | status: 'Some requested entity was not found', self: "The specified bucket does not exist.", metadata: {"pcx-high-bwd-bin": "KgUYDJgBDA", "pc-high-bwd-bin": "S2dVWURKZ0JEQQ", "endpoint-load-metrics-bin": "MTNXxa5RAWFASRiy+XxgNOQ/", "grpc-server-stats-bin": "AABSqAEHAAAAAA", "content-type": "application/grpc", "grpc-accept-encoding": "identity, deflate, gzip", "x-guploader-uploadid": "AOCedOEj4K5XY4Vg0eQbmozKSGORF28Ut41qGQOYhi4t2i-0auvxV3kDdgxzLdn66SwcJJM7", "content-length": "0", "date": "Tue, 25 Nov 2025 15:09:58 GMT"}
  | Error: the service reports an error with code RESOURCE_EXHAUSTED described as: Create Bucket quota limit limit exceeded on the Google Cloud project. Please slow down execution and try again.
  |  
  | Caused by:
  | status: 'Some resource has been exhausted', self: "Create Bucket quota limit limit exceeded on the Google Cloud project. Please slow down execution and try again.", metadata: {"pcx-high-bwd-bin": "KgUYE5gBEw", "pc-high-bwd-bin": "S2dVWUU1Z0JFdw", "endpoint-load-metrics-bin": "MfF8m/+YmWNASXwTByKCVOM/", "grpc-server-stats-bin": "AACMO2MCAAAAAA", "content-type": "application/grpc", "grpc-accept-encoding": "identity, deflate, gzip", "x-guploader-uploadid": "AOCedOERxdBrzj0UWsWMCMX3H3DVykLQZgnR6GYBuADaA6GP74tEXeBVDFSK_sYbhQ7t6dMy", "content-length": "0", "date": "Tue, 25 Nov 2025 15:09:58 GMT"}
  |  
  |  
  | failures:
  | storage::driver::quickstart
  |  
  | test result: FAILED. 3 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 13.29s
  |  

https://pantheon.corp.google.com/cloud-build/builds;region=us-central1/fe45a3e8-0384-400f-b085-bf834e2c26f3?e=SqlStudioMysqlLaunch::SqlStudioMysqlEnabled&mods=monitoring_api_staging&project=rust-sdk-testing

[coryan]

Note that retrying the request may result in AlreadyExists errors, we can handle those, but that complicates the sample more than we probably want.