Tests: clean-up unneeded code

[majocha]

Since the tests run in temp directories by default, this code in single-test.fs should no longer be needed.

Let's see if it is.

[github-actions]

✅ No release notes required

[KevinRansom]

Yeah!!! the tests are probably not as consistent as you think. Different tests, even within the ComponentTests suite have different strategies ... usually depending on how the test originally work.

[majocha]

I think I had that special case handled for that helloworld thing. I'll look into it, as this change works in my experiment PR.

[majocha]

Yes it's like geological strata, sediments upon sediments. But it seems this worked :)

[psfinaki]

Yeah. We are doing geological programming this week :)

Consider conducting some smoke testing from whatever applies in this comment to a sibling PR - among other things, doing this will just help us "compile" some sanity checks for these sorts of PRs.

[majocha]

Subsumed by #17815