gh-124457: Remove coverity from CPython repo

[Mariatta]

Remove coverity from CPython Repo.

There are still some mentions about coverity in the history and changelog for v 2.5. I kept those in there.

• Issue: Drop coverity #124457

[Mariatta]

Wasn't sure if a Misc News entry is needed, and also I wasn't sure which section should it be.
I chose the "Documentation" section here.

[vstinner]

Please keep it. We are using Coverity at Red Hat. cc @stratakis

[stratakis]

While we use coverity at Red Hat, it's usually done on specific time frames using OpenScanHub. And we don't utilize the coverity scan model file. So overall I believe the removal is fine. Maybe in the future a nice project would be to introduce coverity scanning through either some service, the buildbots or github actions.

[vstinner]

And we don't utilize the coverity scan model file.

Oh, I didn't know that.

[vstinner]

LGTM. Let's remove it. It's easy to add it again if someone decides to use it again.

[Mariatta]

Do I need to backport this?

[Mariatta]

And thanks for the reviews!

[vstinner]

Do I need to backport this?

I don't think so.

[Mariatta]

Thanks, in this case I'll close the issue.