chore(ci): add informational Codecov status checks

[thomasrockhu-codecov]

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What does this PR do?

Hi, Tom from Codecov here. I noticed that you were using Codecov but weren't actually getting any notifications on pull requests. I figured it would be useful to get some idea if code being changed is being tested, but also not blocking CI/merging.

I know there's been a lot of changes on this file previously with statuses, and I just want to make sure if this is not the right solution, what might be useful in getting feedback from Codecov.

Let me know if this makes sense or if we can do something that would be helpful.

What issues does this PR fix or reference?

N/A

New Behavior

Add non-blocking status checks from Codecov

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• [ ] Docs
• [ ] Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• [ ] Tests written/updated

Commits signed with GPG?

Yes

Please review Salt's Contributing Guide for best practices.

See GitHub's page on GPG signing for more information about signing commits with GPG.

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[thomasrockhu-codecov]

bump @garethgreenaway

[dwoz]

Closing this due to inactivity. Anyone should feel free to re-open it if they want to see it through to the end in one release cycle.