WIP: azure: support batched deletions

[arpad-m]

Uses a patched branch of the Azure SDK that adds blob_batch support.

The test_azure::delete_prefix test is failing, otherwise all azure unit tests of remote_storage work.

TODO:

• parse and validate response headers: the subrequests can fail individually, we need to fail the entire operation if even one fails. Right now we just return success if we got a result for the envelope operation.
• maybe unify BlobBatchOperations and TransactionOperations to OdataBatch or something. which crate should it live in??
• tests to ensure we can delete up to the limit many keys

cc #7931

[github-actions]

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_{The comment gets automatically updated with the latest test results
229157e at 2024-12-09T23:58:59.326Z :recycle:}