Support short test urls in openqa-clone-custom-git-refspec

[perlpunk]

I was annoyed by the repeated message that a TODO test was passing:

t/40-script_openqa-clone-custom-git-refspec.t           (Wstat: 0 Tests: 45 Failed: 0)
  TODO passed:   30, 32

Because test_cmd() conducts two checks, and only one of them passed, it was not possible to only mark one part of it as TODO, so I thought it would be easier to finally implement it.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.11%. Comparing base (12f3e8e) to head (d6e8f26).
Report is 7 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6594   +/-   ##
=======================================
  Coverage   99.11%   99.11%           
=======================================
  Files         399      399           
  Lines       40717    40717           
=======================================
  Hits        40358    40358           
  Misses        359      359           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[okurz]

Awesome, thank you!