Codecov is inaccurate for some bridged providers

[blampe]

https://pulumi.slack.com/archives/C02FXTZEZ6W/p1734114857515509

We recently starting reporting coverage from most/all of our bridged providers, but it doesn't appear to match what we would expect to see.

I suspect this is due to -coverpkg not working as expected -- this is trying to grab coverage for our provider's module as well as the upstream tf module.

ci-mgmt/provider-ci/internal/pkg/templates/bridged-provider/Makefile

Line 267 in 15dffdf

-coverpkg="./...,github.com/hashicorp/terraform-provider-..." \

I'd recommend generating some coverage locally to confirm it at least captures some expected provider modules. If that's not working as expected I would try just -coverpkg=./.... If coverpkg isn't the issue then there's something wrong with how we're reporting to codecov.