Disables articulation tests in Isaac Sim CI

[kellyguo11]

Description

articulation tests have been timing out in CI. disabling it to unblock isaac sim MR merging until we figure out why the timeouts are happening.

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 removes the @pytest.mark.isaacsim_ci marker from all articulation tests in both isaaclab_physx and isaaclab_newton to prevent them from being selected by the CI suite while timeout issues are investigated.

• All @pytest.mark.isaacsim_ci markers are stripped from every test function in both files (~28 in isaaclab_physx, ~22 in isaaclab_newton); a quick search confirms zero remaining occurrences in either file.
• This is an explicitly temporary workaround with no linked tracking issue; once the root-cause of the timeouts is identified, these markers will need to be restored.

Confidence Score: 5/5

Safe to merge; the change only removes pytest markers from test files and cannot affect production code or runtime behaviour.

Both files are fully cleaned — zero isaacsim_ci markers remain after the change. The removal is mechanically correct and consistent across both packages. The only open question is the missing tracking mechanism for restoring the tests later, but that is a process concern rather than a defect in the code itself.

No files require special attention; changes are limited to pytest marker annotations in two test files.

Important Files Changed

Filename	Overview
source/isaaclab_physx/test/assets/test_articulation.py	Removes @pytest.mark.isaacsim_ci from ~28 test functions; no marker instances remain in the file, change is complete and consistent.
source/isaaclab_newton/test/assets/test_articulation.py	Removes @pytest.mark.isaacsim_ci from ~22 test functions; no marker instances remain in the file, change is complete and consistent.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[CI Pipeline triggers pytest] --> B{Marker filter: isaacsim_ci?}
    B -- Before PR --> C[Collect all tests with @pytest.mark.isaacsim_ci ~50 articulation tests selected]
    B -- After PR --> D[No tests match isaacsim_ci in test_articulation.py files 0 articulation tests run]
    C --> E[Tests run → timeouts in CI]
    D --> F[CI unblocked; articulation tests skipped until root cause is resolved]

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_{Reviews (1): Last reviewed commit: "add changelog fragments" | Re-trigger Greptile}