Fix mesh import filters not displaying correctly on KDE #2731 (backport #2732)

[mergify]

🦟 Bug fix

Fixes #2731

Summary

Adds labels for mesh import type filter to compensate for a bug (related?) in KDE, but is probably good practice anyway.

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

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This is an automatic backport of pull request #2732 done by [Mergify](https://mergify.com).