Return user metadata in GetObjectAttributes API

[maeldonn]

Issue: CLDSRV-817

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
7738	1	7737	0

View the full list of 1 ❄️ flaky test(s)

"after each" hook for "should create a bunch of objects and their versions"::put and head object with versioning With v4 signature "after each" hook for "should create a bunch of objects and their versions"

Flake rate in main: 100.00% (Passed 0 times, Failed 5 times)

Stack Traces | 0.908s run time

The bucket you tried to delete is not empty.

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