Pin Ubuntu to 22.04 for code coverage tests

[HuongNV13]

Ubuntu 24.04 is missing the kcov package. We can pin Ubuntu to 22.04 at the moment

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.97%. Comparing base (126b889) to head (a8f355d).
Report is 6 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (126b889) and HEAD (a8f355d). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (126b889)	HEAD (a8f355d)
behat_test	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #144      +/-   ##
==========================================
- Coverage   63.69%   56.97%   -6.72%     
==========================================
  Files          48       48              
  Lines        1647     1655       +8     
==========================================
- Hits         1049      943     -106     
- Misses        598      712     +114     

Flag	Coverage Δ
behat_bisect_test	40.48% <ø> (+0.16%)	⬆️
behat_test	?
phpunit_bisect_test	34.61% <ø> (-0.18%)	⬇️
phpunit_test	34.67% <ø> (-0.18%)	⬇️
postjobs_test	33.33% <ø> (-0.17%)	⬇️
runner_test	16.13% <ø> (-0.08%)	⬇️

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