Qualify conversion operator type names in the snapshot (#56220)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/56220

Changelog: [Internal]

Conversion operators like `operator jsi::Array` contain a type reference in their name that was not being fully qualified.

This diff adds a `_qualify_conversion_operator_type` step to `FunctionMember.close()` that detects conversion operators and qualifies the type portion of the name using the same mechanism already used for return types and arguments.

Reviewed By: cipolleschi

Differential Revision: D98124781

fbshipit-source-id: 7baf2b6f31fcbf2fdab43457b5792558d774b043