Fix setting metadata back to null bugs

[veewee]

Q	A
Type	bug
BC Break	no
Fixed issues

Summary

[Copilot]

Pull request overview

This PR fixes bugs related to setting metadata properties back to null by replacing optional() with nullable() type coercion. The issue was that optional() would not properly handle explicit null values, preventing metadata from being cleared once set.

Key Changes:

• Updated type coercion from optional() to nullable() for metadata setter methods
• Added test coverage verifying that metadata properties can be set back to null
• Added import for nullable type function

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Metadata/Model/TypeMeta.php	Changed type coercion from optional() to nullable() in withEnums, withExtends, withRestriction, withUnions, and withArrayType methods, and added nullable import
tests/Unit/Metadata/Collection/TypeMetaTest.php	Added test assertions to verify metadata properties can be emptied by passing null and return a new instance

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