tests: fix the flaky test TestGetPeers

[bufferflies]

What problem does this PR solve?

Issue Number: Close #9120

What is changed and how does it work?

Check List

Tests

• Unit test

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

Related changes

Release note

None.

[ti-chi-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please ask for approval from bufferflies, ensuring that each of them provides their approval before proceeding. For more information see the Code Review Process.

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

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

@bufferflies: You cannot manually add or delete the reviewing state labels, only I and the tursted members have permission to do so.

In response to adding label named needs-1-more-lgtm.

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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.28%. Comparing base (bdd857e) to head (f3587c1).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9121      +/-   ##
==========================================
- Coverage   76.31%   76.28%   -0.04%     
==========================================
  Files         473      473              
  Lines       71975    71975              
==========================================
- Hits        54926    54903      -23     
- Misses      13612    13625      +13     
- Partials     3437     3447      +10     

Flag	Coverage Δ
unittests	76.28% <ø> (-0.04%)	⬇️

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

🚀 New features to boost your workflow:

• ❄ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.