[1/4] Create downloadCsvFile util

[tomquirk]

What does this PR do and why?

In prep for export payouts/reserved tokens as csv. This pr adds a util and uses it where possible.

Screenshots or screen recordings

No user-facing change.

Acceptance checklist

• [x] I have evaluated the Approval Guidelines for this PR.
• [x] I have tested this PR in all supported browsers.
• [x] I have tested this PR in dark mode and light mode (if applicable).

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[johnnyd-eth]

Don't think it's related to your PR so I approved, but I am getting this error sometimes on downloading payments:

https://user-images.githubusercontent.com/96150256/186579144-43577535-bbda-4949-bd44-df117c935a9c.mp4

(made issue #1828)