feat(ruby): add deleteFolderRecursive sample

[nidhiii-27]

This adds a sample demonstrating how to recursively delete a folder in a hierarchical namespace bucket.

Fixes: b/521168740

[snippet-bot]

Here is the summary of changes.

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• google-cloud-storage-control/samples/delete_folder_recursive.rb:15, tag storage_control_delete_folder_recursive

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