member: avoid frequent campaign times (#7301)

[ti-chi-bot]

This is an automated cherry-pick of #7301

What problem does this PR solve?

Issue Number: Close #7251, ref #7377

What is changed and how does it work?

when pd leader frequently campaign leader, but etcd leader did not change.
We need to prevent this pd leader campaign and resign to another member.

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HuSharp
• JmPotato

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.

[codecov]

Codecov Report

Merging #7790 (850001a) into release-7.5 (a276843) will decrease coverage by 0.16%.
Report is 4 commits behind head on release-7.5.
The diff coverage is 56.16%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-7.5    #7790      +/-   ##
===============================================
- Coverage        74.62%   74.47%   -0.16%     
===============================================
  Files              443      443              
  Lines            47923    47980      +57     
===============================================
- Hits             35764    35733      -31     
- Misses            8996     9060      +64     
- Partials          3163     3187      +24     

Flag	Coverage Δ
unittests	74.47% <56.16%> (-0.16%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

[HuSharp]

@JmPotato @rleungx PTAL, thx!

[JmPotato]

Should #7501 be cherry-picked as well?

[HuSharp]

Should #7501 be cherry-picked as well?

Okay, #7566 and #7795 can be cherry-picked at the same time

[JmPotato]

/merge

[ti-chi-bot]

@JmPotato: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

You only need to trigger /merge once, and if the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

If you have any questions about the PR merge process, please refer to pr process.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 850001a

[ti-chi-bot]

@ti-chi-bot: Your PR was out of date, I have automatically updated it for you.

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.