# Description

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Fixes callbacks being cleared when stage in memory is attached.
- uses this change Isaac Sim -
[link](https://gitlab-master.nvidia.com/omniverse/isaac/omni_isaac_sim/-/merge_requests/6598)
- removes some of the old callbacks fix, which is no longer needed with
the Isaac Sim change

Reorganizes environment unit tests
- split test_environments -> test_environments and
test_environments_with_stage_in_memory for separate test reporting
- add a utils file for shared functions in isaaclab_tasks/tests
- removes repose cube allegro direct unit test which can cause an OOM
during the CI test
- improves flakey env tests

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## Type of change

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- Bug fix (non-breaking change which fixes an issue)
- New feature (non-breaking change which adds functionality)
- Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- This change requires a documentation update

## Screenshots

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## Checklist

- [X] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [X] 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
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---------
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Signed-off-by: Kelly Guo <kellyguo123@hotmail.com>
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