[sbiscigl]

Issue #, if available:

github.com//issues/3991

Description of changes:

we already skip copying metadata and tags ourselves on small copies, since S3's single-part CopyObject handles them. the annotation copy was just above that check instead of below it, so small copies were still reading and rewriting annotations for nothing. moved it below the check.

tested with a new integration test that copies a small object and checks the annotations land with zero annotation calls from the client (it fails on the old code), and another that copies a 1 GiB object and checks the annotations come over. existing copy tests still pass.

Check all that applies:

• Did a review by yourself.
• Added proper tests to cover this PR. (If tests are not applicable, explain.)
• Checked if this PR is a breaking (APIs have been changed) change.
• Checked if this PR will not introduce cross-platform inconsistent behavior.
• Checked if this PR would require a ReadMe/Wiki update.

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