tests: fix waitFinishMerge to stablize the merge test

[JmPotato]

What problem does this PR solve?

Issue Number: Close #7051.

What is changed and how does it work?

Make `waitFinishMerge` assert the keyspace list after the merge is finished rather than every time.

Check List

Tests

• Unit test
• Integration test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• rleungx

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[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.

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[ti-chi-bot]

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

Commit hash: 3630408

[ti-chi-bot]

@JmPotato: Your PR was out of date, I have automatically updated it for you.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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[codecov]

Codecov Report

Merging #7052 (24c34db) into master (a83322f) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7052      +/-   ##
==========================================
- Coverage   74.41%   74.34%   -0.08%     
==========================================
  Files         436      436              
  Lines       46437    46437              
==========================================
- Hits        34558    34523      -35     
- Misses       8863     8880      +17     
- Partials     3016     3034      +18     

Flag	Coverage Δ
unittests	74.34% <ø> (-0.08%)	⬇️

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[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: 24c34db