Disable codecov PR annotations

[jakkdl]

Codecov's inline annotations in the files window are very flaky and unreliable, see recent example: #13016 (comment)

The official docs have a big warning box saying they're deprecated and bad https://docs.codecov.com/docs/github-checks, but they've still not changed the default codecov/codecov-action#1710

So like we recently did in trio (python-trio/trio#3153) I think we should modify the global pytest-dev codecov config at https://app.codecov.io/account/github/pytest-dev/yaml/ to disable the annotations for all pytest projects.

I can do it myself, but gonna leave this one here for a bit in case anybody has comments or disagree.

[webknjaz]

Yes, please!

[jakkdl]

Updated the yaml, will close this soonish :)