test: check output file caching of run steps with side-effects #20488
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Supersedes #19194 since the underlying issue has already been fixed by #19826.
This just adds a standalone test that executes run steps with and without
std.Build.Step.Run.has_side_effects
and tests whether or not caching has occurred. If this kind of test is undesired, I can adjust it to only check for the existence of the output file since that should be enough to reproduce the issue. I though that a test that checks for caching could be useful 🤷closes #18281