Fixes deprecated teleop device factory to resolve class_type strings

[rwiltz]

Description

Fix TypeError: issubclass() arg 1 must be a class in the deprecated create_teleop_device factory. Device configs (e.g. Se3KeyboardCfg) use {DIR} string placeholders in class_type that are only auto-resolved by @configclass, not plain @DataClass. The factory now resolves these strings before calling issubclass().
Add a new test (test_create_teleop_device_from_devices_cfg) that exercises the factory through the DevicesCfg pattern used by env configs.

Fixes # (issue)

Type of change

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

Checklist

• I have read and understood the contribution guidelines
• I have run the pre-commit checks 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
• 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

[greptile-apps]

Greptile Summary

This PR fixes a TypeError: issubclass() arg 1 must be a class in the deprecated teleop device factory when device configs use @dataclass instead of @configclass. The issue occurred because {DIR} placeholders in class_type fields are only auto-resolved by @configclass, not by @dataclass.

Key changes:

• Added _resolve_class_ref() helper that mirrors the @configclass MRO-walking logic to manually resolve {DIR} placeholders
• Applied the resolution to both device constructors and retargeter constructors before calling issubclass()
• Added comprehensive test coverage through test_create_teleop_device_from_devices_cfg() that exercises the DevicesCfg pattern

The implementation correctly handles inheritance by walking the MRO to find the declaring class, ensuring {DIR} resolves relative to the original declaration. This is a solid, defensive fix for the deprecated factory function.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk - it's a well-isolated bug fix in a deprecated module with proper test coverage
• The implementation correctly mirrors existing @configclass logic for resolving {DIR} placeholders, is applied consistently to both device and retargeter constructors, includes targeted test coverage, and only affects a deprecated factory function. No breaking changes or side effects.
• No files require special attention

Important Files Changed

Filename	Overview
source/isaaclab_teleop/isaaclab_teleop/deprecated/teleop_device_factory.py	Added _resolve_class_ref() helper to resolve {DIR} placeholders in class_type strings before calling issubclass(), fixing TypeError for configs using @dataclass
source/isaaclab_teleop/test/test_openxr_device_constructors.py	Added test test_create_teleop_device_from_devices_cfg() to verify the factory works with DevicesCfg pattern that uses {DIR} placeholders

_{Last reviewed commit: e18d95d}

[greptile-apps]

_{2 files reviewed, no comments}

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[ooctipus]

#4765

@rwiltz Thanks for the PR, I think this would fix it as well?

[kellyguo11]

should be addressed in #4765, will close this one.