Remove Cone shape from particle emitter

[iche033]

🦟 Bug fix

Summary

Similar to https://github.com/gazebosim/sdformat/pull/1434, let's only add cone shape to particle emitters when there is support for it.

Checklist

• [x] 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.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.33%. Comparing base (3eae409) to head (5084179). Report is 15 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #446 +/- ## ========================================== + Coverage 98.19% 98.33% +0.13% ========================================== Files 27 27 Lines 1166 1202 +36 ========================================== + Hits 1145 1182 +37 + Misses 21 20 -1 ```

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