Bump react-intl to v10

[bradenmacdonald]

This bumps react-intl to v10. The only significant API change that affects our MFEs as far as I know is that injectIntl and intlShape are removed, but we shouldn't be using those anyways.

I tested this in frontend-app-instructor-dashboard and it seems to be working fine, although setting it up in packages/ was still a pain due to issues like this.

Fixes #280 - I updated the runtime's i18n module while I'm at it, to match the latest from frontend-platform (basically converts it to TypeScript and removes injectIntl; no other major changes).

Motivation:

1. Earlier version of react-intl pin their typescript dependency; this version avoids that and lets us decide which TypeScript version to use independently of react-intl.
2. Simplifies our dependencies - as you can see, this reduces package-lock.json by about 234 lines 😎

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[bradenmacdonald]

This fix is totally unrelated, but npm run dev wasn't working until I fixed this. I think our CI is not properly checking the shell for TypeScript errors!