[Bug]: add integrated test in HAKeeper for removing zombie replicas.

[w-zr]

Is there an existing issue for the same bug?

• [X] I have checked the existing issues.

Environment

- Version or commit-id (e.g. v0.1.0 or 8b23a93):
- Hardware parameters:
- OS type:
- Others:

Actual Behavior

Zombie replicas are replicas that are removed by raft group but still running in cluster.

We need tests for removing zombie replicas.

Expected Behavior

No response

Steps to Reproduce

No response

Additional information

No response

[w-zr]

wait for testing framework