Fix link pose so that it reflects the parent model's pose

[azeey]

🦟 Bug fix

Summary

The Model pose was not being reflected on the generated MJCF body's pose. The previous approach was working fine in tests because we bypass pose resolution. An integration test where a full SDFormat file is loaded shows the error.

The issue with the previous approach was the setting link.set_raw_pose does not affect the pose graphs in SDFormat, so consequent pose resolution queries do not contain the new pose set via link.set_raw_pose.

Checklist

• [x] Signed all commits for DCO
• [x] Added tests
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if the library has them)
• [x] codecheck passed (See contributing)
• [x] All tests passed (See test coverage)
• [ ] While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov[bot]]

Codecov Report

Merging #52 (25426d3) into main (85787a3) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #52   +/-   ##
=======================================
  Coverage   97.62%   97.62%           
=======================================
  Files          16       16           
  Lines         589      589           
=======================================
  Hits          575      575           
  Misses         14       14           

Impacted Files	Coverage Δ
...format_to_mjcf/sdformat_to_mjcf/converters/link.py	100.00% <100.00%> (ø)
...ormat_to_mjcf/sdformat_to_mjcf/converters/model.py	100.00% <100.00%> (ø)

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