Skip the flaky unix socket test on CI environments

[PROFeNoM]

Description

This test is just too flaky. Retries don't seem effective, and the issue still persists. This issue may arise because of a connection issue with the request replayer.

It is okay for us to mark this test as XFAIL, considering that we know it will sometimes fail for external reasons, and we seemingly have no actionable steps to take when this test is failing.

This time, it succeeded eight times in a row... This time will be the right one.

Reviewer checklist

• Test coverage seems okay.
• Appropriate labels assigned.

[bwoebi]

I have a maybe better idea: avoid running it in CI, but run it locally? At least I'm not seeing it fail locally. So that there's at least some indication when things go wrong.

[PROFeNoM]

That's a good idea (although for me, it either consistently passes or consistently fail locally)

[codecov-commenter]

Codecov Report

Merging #2535 (0bdb4e6) into master (b25dc1e) will decrease coverage by 0.01%.
Report is 2 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2535      +/-   ##
============================================
- Coverage     78.75%   78.74%   -0.01%     
  Complexity      267      267              
============================================
  Files           112      112              
  Lines         13482    13482              
============================================
- Hits          10618    10617       -1     
- Misses         2864     2865       +1     

Flag	Coverage Δ
tracer-extension	78.70% <ø> (-0.01%)	⬇️
tracer-integrations	79.49% <ø> (ø)

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see 1 file with indirect coverage changes

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