Yongbo Jiang

## Enhancement Task as title. Even if waiting some time after PD leader transferred. It will cost time more time for retry.

client: print more info when leader disconnect

2

### What problem does this PR solve? Issue Number: Close #7906 should be merged after #7911 ### What is changed and how does it work? ```commit-message ``` ### Check List...

## Enhancement Task as title

## Development Task

TestAPI/TestStores failed

2

## Flaky Test ### Which jobs are failing TestAPI/TestStores === NAME TestAPI/TestStores api_test.go:659: Error Trace: /home/runner/work/pd/pd/tests/integrations/mcs/scheduling/api_test.go:659 /home/runner/work/pd/pd/tests/testutil.go:310 /home/runner/work/pd/pd/tests/integrations/mcs/scheduling/api_test.go:612 Error: Not equal: expected: 3 actual : 2 Test: TestAPI/TestStores ### CI...