Fix Codecov upload with token

[TheJulianJES]

Proposed change

This fixes the Codecov action by properly using the GitHub secrets token for runs in the main repo.
When Codecov v4 is running in a fork, it'll ignore the provided token (will be empty due to the missing GitHub secret) and forces a tokenless upload.

Built upon the work Nick did in #115321, this also removes wretry, as it should no longer be needed with Codecov v4.

• check this works for branches on the main repo (using token, was always broken before) (this PR did that)
• check this works for branches on forks (using tokenless upload, ignoring missing GH secret) (tested on zigpy repos, HA PR DNM: Remove wretry action from codecov (test run from fork) #115437 will also repeat the check for the core repo)

Do note that on forks, "random" failures might still occur sometimes, as tokenless uploads are constrained by the GitHub API rate limit. Runs on the main repo should "always" work now, as token uploads are not constrained by that API limit.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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To help with the load of incoming pull requests:

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[MartinHjelmare]

This will probably have to wait until the flaky test in bucket 4 has been fixed. It's failing in PRs at the moment.

[bdraco]

that test seems to run fine the first time but fails with

pytest --count=10 tests/components/rtsp_to_webrtc/test_diagnostics.py::test_entry_diagnostics

[bdraco]

#115437 is with secrets running from a fork

[TheJulianJES]

We've also done a bit of testing and switched zigpy repos to using codecov-action v4 with secrets.
It's working fine on both the main repos (token upload) and forks (tokenless).
Tokenless uploads are (obviously) still capped by the GitHub API rate limit, so might still fail intermittently, but token uploads seem solid now.

Related PRs linked in:

• Update Codecov action to v4 zigpy/workflows#17

[bdraco]

If #115321 and #115437 pass I think this is good to go if you want to cleanup the opening text and undraft

[TheJulianJES]

Both of those PRs failed due to an unrelated flakey test now.
This PR confirms that token uploads are working as expected now, as the upload succeeded and the codecov checks show up. (#115321 also tested this again)

For PR from forks, we've had no issues with basically the same codecov setup on all zigpy repos. #115437 also passed now and has the codecov checks visible 🎉

IMO, we should be good to go with this.

[bdraco]

Thanks @TheJulianJES