# Description

Recent isaac sim update introduced a new bug for non-headless scripts
where some scripts were hanging at simulation startup. This change
introduces a new unit test that aims to capture issues like this by
forcing the use of the non-headless app file.

Additionally, the isaac sim CI system has very unstable results for perf
testing, so we are disabling the performance-related tests for the sim
CI.

## Type of change

- Bug fix (non-breaking change which fixes an issue)


## Checklist

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [x]  I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [ ] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there

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