# Description

This PR adds in a few changes that enable the extension based workflow
to work properly.

The main changes are:
* Disable the check for a pre-existing `SimulationContext` in
`manager_based_env.py`
* Move gym spaces setup to load_managers as this can't be called yet in
extension workflow
* Only do `flush` calls if Isaac Sim version < 4.0

Fixes #540

## Type of change

- New feature (non-breaking change which adds functionality)

## 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
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have run all the tests with `./isaaclab.sh --test` and they pass
- [ ] 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

---------
Signed-off-by: Hunter Hansen <50837800+hhansen-bdai@users.noreply.github.com>
Co-authored-by: Hunter Hansen <50837800+hhansen-bdai@users.noreply.github.com>