tests: Integration tests in CI are flaky

[pingyu]

Bug Report

1. Describe the bug

Integration tests in CI are flaky, see https://github.com/tikv/client-java/actions/runs/6288977557/job/17075002180?pr=769

[INFO] Results:
[INFO] 
Error:  Errors: 
Error:    TxnKVIngestTest.txnIngestTest:76 » Grpc retry is exhausted.
Error:    BatchGetTest.BatchGetResolveLockTest:47->TXNTest.putKV:68->TXNTest.putKV:79->TXNTest.prewriteString:86->TXNTest.prewrite:97 » NullPointer
Error:    ReplicaReadTest.leadAndFollowerReadTest:52->doTest:82->TXNTest.putKV:68->TXNTest.putKV:79->TXNTest.prewriteString:86->TXNTest.prewrite:97 » NullPointer
Error:    ReplicaReadTest.leaderReadTest:41->doTest:82->TXNTest.putKV:68->TXNTest.putKV:79->TXNTest.prewriteString:86->TXNTest.prewrite:97 » NullPointer
Error:    ReplicaReadTest.replicaSelectorTest:72->TXNTest.putKV:68->TXNTest.putKV:79->TXNTest.prewriteString:86->TXNTest.prewrite:97 » NullPointer
[INFO] 
Error:  Tests run: 108, Failures: 0, Errors: 5, Skipped: 3

2. Minimal reproduce step (Required)

Invoke CI in pull request.

3. What did you see instead (Required)

CI failed.

4. What did you expect to see? (Required)

CI succeed.

5. What are your Java Client and TiKV versions? (Required)

• Client Java: master (cb26d58)
• TiKV: v5.4.0 (should not be relevant to version of TiKV)