Fix test-seq{-with-skipped} with {root,nested} testable

[frenchy64]

test-seq seems to ignore whether the outer testable is skipped, and test-seq-with-skipped omits skipped tests if they are nested.

[joannecheng]

Thank you so much for this fix, sorry for the delay in getting this merged 🙏

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.62%. Comparing base (e789dad) to head (491ed9e).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #451      +/-   ##
==========================================
+ Coverage   74.50%   74.62%   +0.12%     
==========================================
  Files          52       52              
  Lines        2820     2822       +2     
  Branches      286      284       -2     
==========================================
+ Hits         2101     2106       +5     
+ Misses        523      521       -2     
+ Partials      196      195       -1     

Flag	Coverage Δ
integration	54.32% <60.00%> (+0.06%)	⬆️
unit	69.31% <100.00%> (+0.12%)	⬆️

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