mcs: fix ticker stop in register

[lhy1024]

What problem does this PR solve?

Issue Number: Close #6875

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  pd0: ./pd-server services api
  tso1: ./pd-server services tso --listen-addr="http://127.0.0.1:3380" --backend-endpoints="http://127.0.0.1:2379"
  tso2: ./pd-server services tso --listen-addr="http://127.0.0.1:3379" --backend-endpoints="http://127.0.0.1:2379"

can find register key

then close pd0 and wait a minutes and can see keepalive failed log

and restart pd0 and can see normal and no keepalive failed log anymore

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• JmPotato
• rleungx

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[codecov]

Codecov Report

Merging #6876 (6449ae5) into master (d664827) will decrease coverage by 0.04%.
The diff coverage is 52.00%.

❗ Current head 6449ae5 differs from pull request most recent head 8ab03aa. Consider uploading reports for the commit 8ab03aa to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6876      +/-   ##
==========================================
- Coverage   74.09%   74.05%   -0.04%     
==========================================
  Files         427      420       -7     
  Lines       44968    44200     -768     
==========================================
- Hits        33318    32732     -586     
+ Misses       8696     8556     -140     
+ Partials     2954     2912      -42     

Flag	Coverage Δ
unittests	74.05% <52.00%> (-0.04%)	⬇️

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[lhy1024]

The test can also pass in the master branch.

Thanks, I have ensured master branch cannot pass with new test

[rleungx]

/merge

[ti-chi-bot]

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

/run-all-tests

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[ti-chi-bot]

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

Commit hash: ea39e66

[ti-chi-bot]

@lhy1024: Your PR was out of date, I have automatically updated it for you.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.

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