chore(tests): refactor and enhance test cases to prevent flaky test failure

[git-hulk]

This may fix flaky tests:

--- FAIL: TestLogClean (4.08s)
    logclean_test.go:63: 
        	Error Trace:	/home/runner/work/kvrocks/kvrocks/tests/gocase/unit/log/logclean_test.go:63
        	Error:      	Not equal: 
        	            	expected: true
        	            	actual  : false
        	Test:       	TestLogClean
FAIL
exit status 1

and

Traceback (most recent call last):
  File "/home/runner/work/kvrocks/kvrocks/utils/kvrocks2redis/tests/check_consistency.py", line 132, in <module>
    redis_comparator.compare_redis_data(args.key_file)
  File "/home/runner/work/kvrocks/kvrocks/utils/kvrocks2redis/tests/check_consistency.py", line 91, in compare_redis_data
    self._import_and_compare(100)
  File "/home/runner/work/kvrocks/kvrocks/utils/kvrocks2redis/tests/check_consistency.py", line 116, in _import_and_compare
    raise AssertionError(f"Data mismatch for key '{key}': source data: '{src_data}' destination data: '{dst_data}'")
AssertionError: Data mismatch for key 'key_[36](https://github.com/apache/kvrocks/actions/runs/10895781702/job/30235147974#step:18:37)': source data: 'value_36' destination data: 'None'

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
60.7% Coverage on New Code
1.3% Duplication on New Code

See analysis details on SonarCloud