test(s3): cover list versions NotFound fallback

[overtrue]

Related issue

No external issue. This is a focused test-gap follow-up for the recently merged S3 version-listing error handling.

Background

Recent changes made list_object_versions_page preserve backend error codes so missing buckets map to Error::NotFound. The existing regression coverage exercised NoSuchBucket, while the sibling NotFound fallback branch remained uncovered.

Solution

Add a narrow rc-s3 unit test that feeds a 404 response with x-amz-error-code: NotFound into list_object_versions_page and asserts it returns Error::NotFound with the expected bucket message.

Validation

• cargo test -p rc-s3 list_object_versions_page_maps_not_found_code_to_not_found --lib
• make pre-commit

[Copilot]

Pull request overview

Adds a focused regression test in rc-s3 for the list_object_versions_page missing-bucket error path, ensuring the recently introduced NotFound fallback remains covered in the S3 client’s error mapping.

Changes:

• Adds a new async unit test for list_object_versions_page with a 404 + x-amz-error-code: NotFound response.
• Verifies the client returns Error::NotFound with the expected bucket-specific message.
• Extends existing nearby regression coverage for related S3 error-mapping behavior.

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