[Backport release/3.0.0] Fix SpaceNavigator device detection (#7593)

# Description

Backports #7544 to `release/3.0.0` after the automated backport workflow
skipped the checked selection.

This is an exact cherry-pick of merged commit
`6fdadeac68be8f01813a4f260b66b9e85d1af9ae`. It adds legacy 3Dconnexion
SpaceNavigator detection, the original changelog fragment, and the
original contributor entry. No additional dependencies are required.

## Type of change

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

## Release backport

- This PR directly targets `release/3.0.0`; no further backport is
requested.

## Screenshots

Not applicable. This change affects HID device detection and does not
alter the user interface.

## Testing

- [x] Validated the candidate with `.github/scripts/backport.py
validate-candidate --exact_patch` against #7544.
- [x] Ran the full pre-commit suite; all hooks passed.
- [ ] Hardware validation was not repeated for this exact cherry-pick.
The original PR was manually tested on Linux with a SpaceNavigator.

## Checklist

- [x] I have read and understood the contribution guidelines
- [x] I have run the pre-commit checks
- [x] Documentation changes are not required because this change does
not affect the public API
- [x] My changes generate no new warnings
- [x] The original fix and validation are preserved exactly
- [x] The original changelog fragment is included
- [x] The original contributor entry is included

Signed-off-by: Pranav Shirgur <pranav.shirgur@gmail.com>
Co-authored-by: Pranav Shirgur <49152866+5hirgur@users.noreply.github.com>

Author: kellyguo11

CONTRIBUTORS.md

@@ -167,6 +167,7 @@ Guidelines for modifications:
 * Peter Verswyvelen
 * Philipp Reist
 * Piotr Barejko
+* Pranav Shirgur
 * Pulkit Goyal
 * Qian Wan
 * Qingyang Jiang

source/isaaclab/changelog.d/fix-spacenavigator-support.rst

@@ -0,0 +1,4 @@
+Fixed
+^^^^^
+
+* Fixed detection of legacy 3Dconnexion SpaceNavigator devices in the SpaceMouse interface.

source/isaaclab/isaaclab/devices/spacemouse/se3_spacemouse.py

@@ -142,6 +142,7 @@ def _find_device(self):
                     or device["product_string"] == "SpaceMouse Wireless"
                     or device["product_string"] == "SpaceNavigator for Notebooks"
                     or device["product_string"] == "3Dconnexion Universal Receiver"
+                    or device["product_string"] == "SpaceNavigator"
                 ):
                     # set found flag
                     found = True