chore: consolidate all choose function stuff in util-utils.ts

[rossiam]

Moved all the supporting types and variables for createChooseFn into the same file as createChooseFn. Not sure why I didn't do this when I created createChooseFn. Also updated affected unit tests.

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Latest commit: a60e2f90ad82c69b0aac0510433af4dc82050c43

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