[Codegen-139] Move verifyProprsNotAlreadyDefined Function To parsers-commons.js

[branaust]

Summary:

Move the verifyProprsNotAlreadyDefined functions from Flow and from TypeScript to the parsers-commons.js file. Use the new function in place of the others.

Changelog:

[Internal] [Changed] - Moved verifyProprsNotAlreadyDefined to parsers-commons.js

Test Plan

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@rshest has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[cipolleschi]

Hi @branaust, thanks for spending the time working on this. The code looks good! 😄 great job! 👏

[facebook-github-bot]

@rshest merged this pull request in a108dcb.