Adds msgpack to license exception (#3687)

# Description

msgpack is required by ray when installing rl_games. it has an apache
2.0 license, so we are adding it to the exceptions list since the
license shows up as UNKNOWN by the license checker.


## Type of change

<!-- As you go through the list, delete the ones that are not
applicable. -->

- Documentation update

## Checklist

- [x] I have read and understood the [contribution
guidelines](https://isaac-sim.github.io/IsaacLab/main/source/refs/contributing.html)
- [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
- [ ] 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

<!--
As you go through the checklist above, you can mark something as done by
putting an x character in it

For example,
- [x] I have done this task
- [ ] I have not done this task
-->

.github/workflows/license-exceptions.json

@@ -425,5 +425,10 @@
     "package": "pipdeptree",
     "license": "UNKNOWN",
     "comment": "MIT"
+  },
+  {
+    "package": "msgpack",
+    "license": "UNKNOWN",
+    "comment": "Apache 2.0"
   }
 ]

tools/test_settings.py

@@ -32,6 +32,7 @@ PER_TEST_TIMEOUTS = {
     "test_simulation_render_config.py": 500,
     "test_operational_space.py": 500,
     "test_non_headless_launch.py": 1000,  # This test launches the app in non-headless mode and starts simulation
+    "test_rl_games_wrapper.py": 500,
 }
 """A dictionary of tests and their timeouts in seconds.