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

[oneby-wang]

Motivation

See apache#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.

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