[Chapel Merge] Keep submitted shootout benchmarks directory in sy

Branch: refs/heads/master
Revision: 7ba94a4
Author: bradcray
Log Message:

Merge pull request #17601 from bradcray/keep-submitted-shootouts-in-sync-and-running

Keep submitted shootout benchmarks directory in sync with website & running

[reviewed by @lydia-duncan]

This makes some simple changes to the submitted shootout benchmarks
directory to bring them back in sync with the official website and
running correctly. While here, I also updated the README to attempt to
clarify what should or shouldn't be done w.r.t. the tests when they break
over time (though I'm not surprised that this is forgotten or overlooked
in a given PR).

And while there, I updated the README to try and connect the dots between
the files in this directory and the official shootout codes a bit more clearly, and
dropped the mention of the retired benchmarks (which got introduced in #17745
due to some confusion on my part).

Modified Files:
A test/studies/shootout/submitted/mandelbrot3.compopts

R test/studies/shootout/submitted/mandelbrot3.notest
M test/studies/shootout/submitted/README.md
M test/studies/shootout/submitted/regexredux2.chpl
M test/studies/shootout/submitted/regexredux2.good
M test/studies/shootout/submitted/regexredux3.chpl
M test/studies/shootout/submitted/regexredux3.good

Compare: https://github.com/chapel-lang/chapel/compare/d690e1b53738...7ba94a484739