[fix][test] Use AtomicBoolean.compareAndSet() to guarantee atomicity in testDoIndividualBatchAckNeverAffectIsDuplicate() method

[oneby-wang]

Motivation

See #25208 (comment)

The assertResult.set(assertResult.get() || duplicate) operation can't guarantee atomicity. After being set to true, the value of assertResult may be overwritten to false again.

Modifications

Use assertResult.compareAndSet(false, duplicate) to guarantee atomicity.

Verifying this change

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• Dependencies (add or upgrade a dependency)
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Documentation

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Matching PR in forked repository

PR in forked repository: oneby-wang#27

[oneby-wang]

cc @Denovo1998

[lhotari]

/pulsarbot rerun-failure-checks