Update GetObjectAttributes CTST tests to use aws SDK client

[maeldonn]

Issue: ZENKO-5208

[bert-e]

Hello maeldonn,

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[bert-e]

Incorrect fix version

The Fix Version/s in issue ZENKO-5208 contains:

• None

Considering where you are trying to merge, I ignored possible hotfix versions and I expected to find:

• 2.14.1

Please check the Fix Version/s of ZENKO-5208, or the target
branch of this pull request.