Skip flaky test: test_groupby_query

[devinfra-flakiness]

Please help us keep Sentry flake-free by merging this PR while a longer-term
resolution is implemented in issue #93953.

Test: tests/snuba/sessions/test_sessions_v2.py::test_groupby_query

Statistics over the last 30 days:
* Runs Recorded: 641
* Flakes Failed: 0 (0%)
* Flakes Retried: 614 (95.787832%)

Example Flakes:

• https://github.com/getsentry/sentry/actions/runs/15783508731/job/44494684382
• https://github.com/getsentry/sentry/actions/runs/15783035231/job/44493146231
• https://github.com/getsentry/sentry/actions/runs/15782491615/job/44491342051
• https://github.com/getsentry/sentry/actions/runs/15773617919/job/44463102175
• https://github.com/getsentry/sentry/actions/runs/15773600786/job/44463052431

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See also:
Flaky Test Policy & Responsibilities

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

⚠️ Parser warning

The parser emitted a warning. Please review your JUnit XML file:

Warning while parsing testcase attributes: Limit of string is 1000 chars, for name, we got 2083 at 1:161173 in /home/runner/work/sentry/sentry/.artifacts/pytest.junit.xml

For more help, visit our troubleshooting guide.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #93954       +/-   ##
===========================================
+ Coverage   46.41%   85.59%   +39.18%     
===========================================
  Files       10333    10349       +16     
  Lines      597257   597996      +739     
  Branches    23222    23222               
===========================================
+ Hits       277188   511870   +234682     
+ Misses     319565    85443   -234122     
- Partials      504      683      +179     

[getsantry]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you add the label WIP, I will leave it alone unless WIP is removed ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀