Remove unnecessary coalesce to empty array

[mfn]

Summary

Reported by phpstan [1]:

Variable $typesFiltered on left side of ?? always exists and is not nullable.

And yep indeed, array_filter cannot return null or undefine the var, so this is not necessary.

[1] https://github.com/rebing/graphql-laravel/actions/runs/16870256928/job/47783542319#step:8:14

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Type of change:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Misc. change (internal, infrastructure, maintenance, etc.)

Checklist:

• Existing tests have been adapted and/or new tests have been added
• Add a CHANGELOG.md entry
• Update the README.md
• Code style has been fixed via composer fix-style