Support `codecov-action@v4` breaking changes

[brian-smith-tcril]

From slack:

Hi team, we noticed that Codecov has stopped working in frontend-app-authn recently. It seems like it can't find the token.
Does anyone have any idea on how to resolve this?

This happened because openedx/frontend-app-authn#1172 was merged which bumped the codecov action from v3 to v4 without accounting for the breaking changes

Tokenless uploading is unsupported

We use the codecov workflow in quite a few places throughout the org https://github.com/search?q=org%3Aopenedx+uses%3A+codecov%2Fcodecov-action&type=code and I expect dependabot PRs to start making it into a bunch of those repos.

If we want to move to the v4 version of the action we should ensure we make the required changes to support it

• Add a codecov token as an org secret
• Update workflows from

      - name: Run Code Coverage
        uses: codecov/codecov-action@v4

  to

      - name: Run Code Coverage
        uses: codecov/codecov-action@v4
        with:
          token: ${{ secrets.CODECOV_TOKEN }} 

[brian-smith-tcril]

@syedsajjadkazmii it seems in the short term we should just move back to the v3 version of the action because

• Codecov requires tokens per repo, org wide won't work
  • It's possible this can be worked around but we're not sure yet
• There are discussions being had that may lead to deprecating codecov, build: replace codecov with python-coverage-comment-action openedx-events#323

[jristau1984]

Should this still be broken for repos?

[brian-smith-tcril]

It seems the v3 action has started having more intermittent failures. We've also found that codecov requires a repository secret, and cannot use an org secret. If the v3 action is causing issues on a repo the best course of action is to create a request ticket (https://github.com/openedx/axim-engineering/issues/new?assignees=&labels=github-request&projects=&template=04-github-request---repo-settings.yml&title=%5BGH+Request%5D+%3CADD+A+REQUEST+TITLE+HERE%3E) - then someone from Axim can add the repo secret and make a PR updating the action to v4.