[PIP-156][fix][ci] fixed KinesisSinkTest record format error by deaggregation

[heesung-sn]

Master Issue: #15207

Motivation

• As per the Java build 17 upgrade work, KinesisSink's default aggregation is exposed in the KinesisSinkTester. We need to cover this record aggregation behavior in the test.

Modifications

• Updated the KinesisSinkTester to deaggregate response records, if aggregated.

Verifying this change

• [] Make sure that the change passes the CI checks.

This change is already covered by existing tests, such as PulsarSinksTest#testKinesis.

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• Dependencies (does it add or upgrade a dependency): (yes / no)
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• The schema: (yes / no / don't know)
• The default values of configurations: (yes / no)
• The wire protocol: (yes / no)
• The rest endpoints: (yes / no)
• The admin cli options: (yes / no)
• Anything that affects deployment: (yes / no / don't know)

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