Move from create-react-app to parcel

[imnasnainaec]

To follow #2875, #2973, #2975, #3054, #3179, #3313, #3960

Resolves #2133

• Eject CRA and use Parceljs for building the frontend
• Also update to the latest: babel, eslint, jest, typescript

Cuts frontend / docker_build time from ~2:20 to ~1:20, but frontend / test_coverage time is still ~3:20.

(When testing this branch locally, npx jest --clearCache may be necessary if the frontend tests aren't working.)

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This change is 

[jasonleenaylor]

scripts/frontendScripts.js line 11 at r6 (raw file):

ensureFile(folder + "config.js");

// release.js with current version of The Combine

create release.js, or populate release.js with...

Code quote:

// release.js

[jasonleenaylor]

@jasonleenaylor reviewed 24 of 28 files at r5, 11 of 11 files at r6, 3 of 3 files at r7, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)