refactor(ast/estree): move FunctionFormalParameters serializer to be with other serializers for FormalParameters
#10496
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Pure refactor. Revert a small change made in #10462.
FunctionFormalParametersserializer acts onFunction, which is not a TS type (even though the purpose of the custom serializer is to handle a TS-specific field). Keep this serializer with the rest of the serializers related toFormalParameters, rather than with the serializers which act on TS-only AST types.