Send pending status checks on initial receipt of coverage reports

[heaths]

I have codecov/project and codecov/patch set up as required checks and my repo configured to require certain thresholds. The problem is that those aforementioned checks don't always start soon enough and an otherwise successful PR - with reduced code coverage - may be merged using GitHub's auto-merged.

What would be ideal is that when an upload is received via the codecov/codecov-action@v3, it immediate posts back to the PR that a check is running even if it hasn't begun processing. This should be fast enough to allow required branch checks to work as desired.

Example workflow: https://github.com/heaths/azcrypto/blob/5fb26e6cc58cd9743ecf0c2cdf9c9db268a25bea/.github/workflows/ci.yml#L49