Move after_n_builds earlier in the report processing cycle.

[rohan-at-sentry]

Discussed in codecov/feedback#204

^{Originally posted by drazisil-codecov December 27, 2023}
Currently, after_n_builds is a notification setting that tells Codecov to only send comments and statuses after N uploads have been received.

This does not prevent Codecov for running coverage calculations early though, and those results will show in the Codecov UI.

The ask is for after_n_builds to also control if Codedcov runs the coverage calculation before the expected number of uploads are received. This would prevent expected bad information to be shown to the customer via any method.

[nhorton]

This is our biggest frustration with CodeCov right now. Note that I think it is also causing some other bugs. Ex. we have incorrect 'this line was not covered' comments in our PRs, and I am pretty sure it is because they get set by the first report and there is a race condition for fixing them with later reports coming in.

[ftakj]

+1 would like to see this resolved

[ncrmro]

+1

[PabloScolpino]

This is currently causing distractions as we have split our code testing in a few processes for clarity. It would be very much appreciated if some attention was given to this.

[WanxinXia]

+1