Refactor translate UniontypeAnnotation (#35050)

Summary:
Part of #34872
> [Assigned to youedd] This task is more advanced than the others Create a function to unify the [unionType](https://github.com/facebook/react-native/blob/main/packages/react-native-codegen/src/parsers/flow/modules/index.js#L372-L396) and the [TSUnionType](https://github.com/facebook/react-native/blob/main/packages/react-native-codegen/src/parsers/typescript/modules/index.js#L407-L431). This task may share some logic from the previous task. The function should accept a ParserType parameter to implement the proper logic to extract the memberType variable. Ideally, we should create a couple of supporting functions to implement those logics.

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[Internal] [Changed] - Refactor translate UniontypeAnnotation

Pull Request resolved: #35050

Test Plan:
`yarn jest react-native-codegen`
![image](https://user-images.githubusercontent.com/19575877/197334084-2daeed7e-8e87-4140-b8c3-07f2de3f0496.png)

Reviewed By: cortinico

Differential Revision: D40637299

Pulled By: cipolleschi

fbshipit-source-id: 1490001a3398c3af79d465c40de3c3687f058523

Author: youedd