feat: add flag to execute filetests with prefix

[deelawn]

This simply allows a prefix to be set when running filetests so that only a subset of tests are executed. This is especially useful when a PR requires many new filetests -- it allows execution of all new tests without having to wait for ALL tests to run.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.85%. Comparing base (5450f64) to head (a179338).
Report is 77 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2837   +/-   ##
=======================================
  Coverage   60.85%   60.85%           
=======================================
  Files         563      563           
  Lines       75193    75193           
=======================================
+ Hits        45757    45759    +2     
+ Misses      26069    26066    -3     
- Partials     3367     3368    +1     

Flag	Coverage Δ
contribs/gnodev	60.65% <ø> (ø)
contribs/gnofaucet	15.31% <ø> (+0.85%)	⬆️
gno.land	67.17% <ø> (ø)
gnovm	65.63% <ø> (ø)
misc/genstd	80.54% <ø> (ø)
misc/logos	20.23% <ø> (+0.35%)	⬆️
tm2	61.97% <ø> (-0.10%)	⬇️

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[ltzmaxwell]

can we also have this for txtar?

[deelawn]

can we also have this for txtar?

We can but I'd prefer not to do it in this PR.

[piux2]

LGTM.

can we add one or two examples to use the flag for filetests in the description?

[ltzmaxwell]

can we also have this for txtar?

We can but I'd prefer not to do it in this PR.

Yes, of course, 👍

[thehowl]

What's wrong with -run 'TestFiles/^myprefix_'?

[deelawn]

What's wrong with -run 'TestFiles/^myprefix_'?

Nothing is wrong with that. It's just convenient for running tests and debugging. VS Code allows to run tests from right in the editor, as well as running in debug mode so users can set certain breakpoints for a suite of tests. I found myself adding this locally multiple times when diagnosing various issues, so it would probably be useful to others as well.

[thehowl]

Skipping to avoid redundancy with -run.