Prevent setting custom metadata headers on unsupported multipart upload operations

[Beetelbrox]

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Do not set aws custom metadata x-amz-meta-* headers on UploadPart & CompleteMultipartUpload calls

Fixes #60747

Both UploadPart and CompleteMultipartUpload don't accept custom metadata header so we simply drop them if we attept to add them to the request.

This error only happens when running agains S3 proper and I have no idea how to test it in the CI, as far as I can tell relies on MinIO. Any help on this would be much appreciated.

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[Beetelbrox]

@CheSema Would it be possible to backport this? We have features that depends on this fix and we're blocked until the next CH release to release them.

Thanks!