Add `Bucket Lock` immutable objects support for AWS S3#818

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ishan16696 wants to merge 4 commits intogardener:masterfrom ishan16696:immutable/S3

+463-66

Commits on Jan 3, 2025

Enables backup-restore to handle S3's object lock mechanism which will make snapshots immutable.
ishan16696
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Address review comments.
ishan16696
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Commits on Jan 6, 2025