MuonGeoModelTestR4: run unit test in private working directory
Unit tests that actually run athena, need their own private working directory to avoid overwriting each others files (e.g. pool catalogue) when they happen to run concurrently (as seen on !68990 (merged)). Also use noerror.sh
for post-processing to detect any errors printed by the test.
Also update simulation flags to avoid error message (see ATLASSIM-7094).
cc @jojungge
Edited by Frank Winklmeier