add enable_flaky_tests and skip some flaky tests in gctuner (#5975)

[ti-chi-bot]

This is an automated cherry-pick of #5975

Signed-off-by: Sen Han 00hnes@gmail.com

What problem does this PR solve?

Issue Number: ref #5953

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024

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[ti-chi-bot]

@ti-chi-bot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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[lhy1024]

/ok-to-test

[codecov]

Codecov Report

Base: 75.22% // Head: 75.06% // Decreases project coverage by -0.17% ⚠️

Coverage data is based on head (90e8013) compared to base (2be26ff).
Patch has no changes to coverable lines.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-6.6    #5977      +/-   ##
===============================================
- Coverage        75.22%   75.06%   -0.17%     
===============================================
  Files              362      362              
  Lines            36221    36221              
===============================================
- Hits             27247    27189      -58     
- Misses            6600     6652      +52     
- Partials          2374     2380       +6     

Flag	Coverage Δ
unittests	75.06% <ø> (-0.17%)	⬇️

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

Impacted Files	Coverage Δ
pkg/gogc/gogc.go	9.09% <0.00%> (-54.55%)	⬇️
pkg/gctuner/memory_limit_tuner.go	46.66% <0.00%> (-42.23%)	⬇️
pkg/gctuner/finalizer.go	70.00% <0.00%> (-30.00%)	⬇️
server/api/diagnostic.go	76.92% <0.00%> (-23.08%)	⬇️
pkg/cgroup/cgroup_cpu_linux.go	22.22% <0.00%> (-16.67%)	⬇️
pkg/gctuner/tuner.go	60.00% <0.00%> (-12.00%)	⬇️
pkg/tso/local_allocator.go	68.91% <0.00%> (-6.76%)	⬇️
server/cluster/diagnostic_manager.go	72.04% <0.00%> (-4.31%)	⬇️
pkg/storage/storage.go	67.30% <0.00%> (-3.85%)	⬇️
pkg/tso/tso.go	71.34% <0.00%> (-3.38%)	⬇️
... and 18 more

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[hnes]

Closed because this PR is not necessary for release-6.6.