Issue #3568588: Fix getSupportedTypes() to only handle json_schema format

Zach Bimsonrequested to merge
issue/tool-3568588:3568588-getsupportedtypes-fix into 1.0.x
  • Return empty array for non-json_schema formats (cached by Symfony)
  • Fix typo: Attributes -> Attribute (singular)

Closes #3568588

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