SDFormat -> MJCF: Set mesh scale

[azeey]

🦟 Bug fix

Summary

The mesh scale was not being set when converting from SDFormat to MJCF.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• 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.

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[codecov]

Codecov Report

Merging #111 (29f21ee) into main (b535b80) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #111   +/-   ##
=======================================
  Coverage   95.29%   95.30%           
=======================================
  Files          24       24           
  Lines        1170     1171    +1     
=======================================
+ Hits         1115     1116    +1     
  Misses         55       55           

Impacted Files	Coverage Δ
...ormat_mjcf/sdformat_to_mjcf/converters/geometry.py	94.28% <100.00%> (+0.08%)	⬆️

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