Add a codecov token or revert fail_ci_if_error

[spencerschrock]

Now that codecov fails CI, some rate limiting that was occurring before is now a blocker for some PRs. Adding a token to a public repo, though not required, helps with these rate limits.

- uses: codecov/codecov-action@v3
  with:
    token: ${{ secrets.CODECOV_TOKEN }} # not required for public repos

See codecov/codecov-action#557 (comment) and comments more details.

The other alternative is reverting #2415

[spencerschrock]

I'm leaning towards reverting, as the token isn't a perfect fix. The goal was to surface typos in codecov uploads, but seems to be doing more harm than good