TestHandleError is unstable

[zhaoxinyu]

Which jobs are flaking?

unit test

Which test(s) are flaking?

TestHandleError

Jenkins logs or GitHub Actions link

[2022-03-30T03:34:14.276Z]     client_test.go:309: 
[2022-03-30T03:34:14.276Z]         	Error Trace:	client_test.go:309
[2022-03-30T03:34:14.276Z]         	            				client_test.go:635
[2022-03-30T03:34:14.276Z]         	Error:      	Expected nil, but got: &errors.Error{code:0, codeText:"CDC:ErrReachMaxTry", message:"reach maximum try: %d", redactArgsPos:[]int(nil), cause:(*errors.fundamental)(0xc0004e5d70), args:[]interface {}{20}, file:"/home/jenkins/agent/workspace/ut-check/tiflow/pkg/retry/retry_with_opt.go", line:65}
[2022-03-30T03:34:14.276Z]         	Test:       	TestHandleError

https://ci.pingcap.net/blue/organizations/jenkins/ut-check/detail/ut-check/7599/pipeline/

Anything else we need to know

• Does this test exist for other branches as well?

• Has there been a high frequency of failure lately?

[Rustin170506]

Close it because it looks like it hasn't happened again for a long time.