Fixes carb subscription API for gamepad device (#2173)

# Description

Please include a summary of the change and which issue is fixed. Please
also include relevant motivation and context.
List any dependencies that are required for this change.

Fixes # SE2/3 gamepad that calling wrong omniverse API,
[https://docs.omniverse.nvidia.com/dev-guide/latest/programmer_ref/input-devices/gamepad.html#unsubscribing-the-gamepad-event-handler](url)

## 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
- [x] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [x] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there

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---------
Signed-off-by: AlvinC <alvincny529@gmail.com>

CONTRIBUTORS.md

@@ -77,6 +77,7 @@ Guidelines for modifications:
 * Michael Noseworthy
 * Muhong Guo
 * Nicola Loi
+* Nuoyan Chen (Alvin)
 * Nuralem Abizov
 * Ori Gadot
 * Oyindamola Omotuyi

source/isaaclab/isaaclab/devices/gamepad/se2_gamepad.py

@@ -87,7 +87,7 @@ class Se2Gamepad(DeviceBase):
 
     def __del__(self):
         """Unsubscribe from gamepad events."""
-        self._input.unsubscribe_from_gamepad_events(self._gamepad, self._gamepad_sub)
+        self._input.unsubscribe_to_gamepad_events(self._gamepad, self._gamepad_sub)
         self._gamepad_sub = None
 
     def __str__(self) -> str:

source/isaaclab/isaaclab/devices/gamepad/se3_gamepad.py

@@ -88,7 +88,7 @@ class Se3Gamepad(DeviceBase):
 
     def __del__(self):
         """Unsubscribe from gamepad events."""
-        self._input.unsubscribe_from_gamepad_events(self._gamepad, self._gamepad_sub)
+        self._input.unsubscribe_to_gamepad_events(self._gamepad, self._gamepad_sub)
         self._gamepad_sub = None
 
     def __str__(self) -> str: