[8.x] Add IMDSv2 support to repository-s3 (#117748)
#117817
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The version of the AWS Java SDK we use already magically switches to IMDSv2 if available, but today we cannot claim to support IMDSv2 in Elasticsearch since we have no tests demonstrating that the magic really works for us. In particular, this sort of thing often risks falling foul of some restrictions imposed by the security manager (if not now then maybe in some future release). This commit adds proper support for IMDSv2 by enhancing the test suite to add the missing coverage to avoid any risk of breaking this magical SDK behaviour in future. Closes elastic#105135 Closes ES-9984
DaveCTurner
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:Distributed Coordination/Snapshot/Restore
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Backports the following commits to 8.x:
repository-s3(Add IMDSv2 support torepository-s3#117748)