[DUOS-2977] Switch file extensions to JSX

[fboulnois]

Addresses

https://broadworkbench.atlassian.net/browse/DUOS-2977

Summary

Switches the file extensions of the converted files in #2475 and related tickets to JSX. This should make it easier for Gideon to determine which files still need to be converted.

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[rushtong]

Manually spot checked 👍🏽

[aarohinadkarni]

👍