[Chapel Merge] Clear the playgrounds as I am no longer using them (at the moment)

Branch: refs/heads/main
Revision: 52b2fae338c970146d3deae7ddca5cd7d6b921a5
Author: dlongnecke-cray
Link: Clear the playgrounds as I am no longer using them (at the moment) by dlongnecke-cray · Pull Request #28717 · chapel-lang/chapel · GitHub
Log Message:
Clear the playgrounds as I am no longer using them (at the moment) (#28717)

Shortly, I will be merging adjustments to the runtime in small batches.
I will do some tests on the multi-locale playground at that time, but
currently I keep breaking the testing branch too often.

Compare: Comparing fb3b9b9285daa8c029de2ad9959f0b641965efde...48c9528fdc8967e403bce375b26917a33d35ac95 · chapel-lang/chapel · GitHub

Diff:
M util/cron/test-perf.chapcs.playground.bash
M util/cron/test-perf.hpe-apollo-hdr.gasnet-ibv.playground.bash
https://github.com/chapel-lang/chapel/pull/28717.diff