chore(Storage Control) Relocate storage control sample

[XrossFox]

Relocate Storage Control sample to delete nested HNS Folders.

Fixes # b/503111470 #14090

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Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[gemini-code-assist]

Code Review

This pull request updates the documentation regarding GCS folder behavior and modifies the delete_empty_folders.py script. Key feedback includes a critical bug in the should_retry function where integer status codes are incorrectly compared to gRPC enums, which would prevent retries from functioning. Additionally, the reviewer suggests increasing the MAX_WORKERS count for better performance and moving the retry_policy instantiation to the module level to improve efficiency by avoiding redundant object creation.

[iennae]

generally, you have to do these in 2 phases. 1 create the new location, update documentation, delete old, or freeze the sample where it's being pulled in documentation, move, and then unfreeze. Are you doing either of those processes here?

[XrossFox]

generally, you have to do these in 2 phases. 1 create the new location, update documentation, delete old, or freeze the sample where it's being pulled in documentation, move, and then unfreeze. Are you doing either of those processes here?

Hello, i forgot and skipped a step by pre-emptively deleting the source. Will restore files, then once merged, edit doc (https://docs.cloud.google.com/storage/docs/hns-buckets-best-practices.md) and then finally delete old code again.