Encapsulate runner output cleanup into single script

[fabriziomello]

Disable-check: force-changelog-file

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.15%. Comparing base (59f50f2) to head (8607998).
Report is 638 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7511      +/-   ##
==========================================
+ Coverage   80.06%   82.15%   +2.08%     
==========================================
  Files         190      230      +40     
  Lines       37181    43191    +6010     
  Branches     9450    10869    +1419     
==========================================
+ Hits        29770    35484    +5714     
- Misses       2997     3383     +386     
+ Partials     4414     4324      -90     

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[timescale-automation]

Automated backport to 2.17.x not done: cherry-pick failed.

Git status

HEAD detached at origin/2.17.x
You are currently cherry-picking commit 049714cde.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	new file:   test/runner_cleanup_output.sh
	modified:   test/runner_isolation.sh
	modified:   test/runner_shared.sh

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   test/runner.sh

Job log