tso: improve skipping sync condition and add more logs

[JmPotato]

What problem does this PR solve?

Issue Number: Close #7138.

What is changed and how does it work?

Only skip the sync if the following conditions are met:

1. The timestamp in memory has been initialized.
2. The last saved timestamp in etcd is not zero.
3. The last saved timestamp in memory is not zero.
4. The last saved timestamp in etcd is equal to the last saved timestamp in memory.

Check List

Tests

• Unit test
• Integration test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024
• rleungx

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[codecov]

Codecov Report

Merging #7139 (84536fc) into master (e6c8841) will increase coverage by 0.02%.
Report is 5 commits behind head on master.
The diff coverage is 52.63%.

❗ Current head 84536fc differs from pull request most recent head 48682cc. Consider uploading reports for the commit 48682cc to get more accurate results

@@            Coverage Diff             @@
##           master    #7139      +/-   ##
==========================================
+ Coverage   74.31%   74.33%   +0.02%     
==========================================
  Files         440      440              
  Lines       47217    47194      -23     
==========================================
- Hits        35088    35083       -5     
+ Misses       9034     9010      -24     
- Partials     3095     3101       +6     

Flag	Coverage Δ
unittests	74.33% <52.63%> (+0.02%)	⬆️

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

[JmPotato]

/merge

[lhy1024]

/merge

[ti-chi-bot]

@JmPotato: 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]

@lhy1024: 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: 545363b

[ti-chi-bot]

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

Commit hash: 545363b

[CabinfeverB]

/hold

[JmPotato]

/hold

[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]

@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.

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.