Fixes frame transform duplicate log

[klakhi]

Description

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Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (existing functionality will not work without user modification)
• Documentation update

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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
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[greptile-apps]

Greptile Summary

Changed non_identity_offset_frames from a list to a set to prevent duplicate frame names from appearing in log messages when multiple environments reference the same frames. The log output is now sorted for consistency.

• Replaced list with set() initialization on line 167
• Changed append() to add() on line 228
• Added sorted() call when logging the frame names on line 240

This fix ensures that each unique frame name appears only once in the log message, regardless of how many environments use that frame.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• Simple data structure change (list to set) with no behavioral impact beyond deduplicating log messages; the change is well-scoped and correct
• No files require special attention

Important Files Changed

Filename	Overview
source/isaaclab_physx/isaaclab_physx/sensors/frame_transformer/frame_transformer.py	Changed non_identity_offset_frames from list to set to avoid duplicate frame names in logs, sorted output for consistent logging

_{Last reviewed commit: 4f41d84}

[greptile-apps]

_{1 file reviewed, no comments}

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[AntoineRichard]

Thanks for the fix!

[klakhi]

@kellyguo11 please help merge , thanks.