KAFKA-17730: ReplicaFetcherThreadBenchmark is broken

[FrankYang0529]

Update ReplicaFetcherThreadBenchmark to kraft.

Following is result with small iteration and partition count:

Benchmark                                  (partitionCount)  Mode  Cnt    Score   Error  Units
ReplicaFetcherThreadBenchmark.testFetcher                 1  avgt       186.845          ns/op
ReplicaFetcherThreadBenchmark.testFetcher                 5  avgt       309.472          ns/op
ReplicaFetcherThreadBenchmark.testFetcher                10  avgt       665.032          ns/op
ReplicaFetcherThreadBenchmark.testFetcher                15  avgt       913.064          ns/op
JMH benchmarks done

Committer Checklist (excluded from commit message)

• Verify design and implementation
• Verify test coverage and CI build status
• Verify documentation (including upgrade notes)