cluster: add integration tests for tiproxy

[xhebox]

What problem does this PR solve?

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5811bbb) 55.36% compared to head (0a62110) 52.98%.

❗ Current head 0a62110 differs from pull request most recent head 3ef2893. Consider uploading reports for the commit 3ef2893 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2371      +/-   ##
==========================================
- Coverage   55.36%   52.98%   -2.38%     
==========================================
  Files         329      329              
  Lines       35020    35020              
==========================================
- Hits        19388    18554     -834     
- Misses      13298    14244     +946     
+ Partials     2334     2222     -112     

Flag	Coverage Δ
cluster	42.50% <ø> (-2.24%)	⬇️
dm	18.96% <ø> (-6.55%)	⬇️
tiup	33.60% <ø> (-0.05%)	⬇️
unittest	22.24% <ø> (-0.01%)	⬇️

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[kaaaaaaang]

/lgtm

[kaaaaaaang]

/approve

[ti-chi-bot]

@xhebox: Your PR was out of date, I have automatically updated it for you.

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[kaaaaaaang]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-29 05:35:46.558120539 +0000 UTC m=+1370988.122418258: ☑️ agreed by kaaaaaaang.
• 2024-01-29 05:36:04.067770888 +0000 UTC m=+1371005.632068593: ✖️🔁 reset by ti-chi-bot[bot].
• 2024-01-29 05:49:31.248238662 +0000 UTC m=+1371812.812536366: ☑️ agreed by kaaaaaaang.

[kaaaaaaang]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kaaaaaaang

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