Adds Unit Tests for NewtonWarpRenderer

[daniela-hase]

Description

Added Unit Tests for NewtonWarpRenderer

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 contains bug fixes for the Newton Warp Renderer that enable unit tests to pass.

Changes:

• Removed unused self.sensor field in RenderData.__init__()
• Fixed tensor conversion in RenderData.update() by properly converting positions tensor to warp vec3f view
• Added defensive null check for _annotators in TiledCamera.__del__() to prevent AttributeError during cleanup

Note: Despite the PR title "Added Unit Tests for NewtonWarpRenderer", no new test files were added in this PR. The changes fix issues that were preventing existing tests from passing.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The changes are well-contained bug fixes that improve code robustness. The removal of unused code and defensive null checks reduce potential runtime errors. The tensor conversion fix ensures proper data types for warp operations.
• No files require special attention

Important Files Changed

Filename	Overview
source/isaaclab/isaaclab/renderers/newton_warp_renderer.py	Removed unused self.sensor field and fixed tensor view conversion for positions in transform update
source/isaaclab/isaaclab/sensors/camera/tiled_camera.py	Added null check for _annotators in destructor to prevent potential attribute error during cleanup

_{Last reviewed commit: de26f15}

[greptile-apps]

_{2 files reviewed, no comments}

_{Edit Code Review Agent Settings | Greptile}

[kellyguo11]

does the newton renderer work on CPU as well?