Plugins test files not seen by coverage reports

[robrap]

Plugins test files are not seem by the coverage report, which probably means they aren't running. Either way, we should get this coverage gap fixed.

See https://app.codecov.io/gh/openedx/edx-django-utils

The drop in coverage started on this commit: https://app.codecov.io/gh/openedx/edx-django-utils/commit/3639ab70e18012534f730b4cff0469a2a1e43c77

[robrap]

@UsamaSadiq: Note that if this turns out to be an issue that could affect multiple repos, we should inform and/or fix. Thank you.

[nedbat]

The drop in coverage started on this commit: https://app.codecov.io/gh/openedx/edx-django-utils/commit/3639ab70e18012534f730b4cff0469a2a1e43c77

That commit moved coverage.py from 6.x to 7.x, which changed how wildcards are interpreted.

The wildcards in .coveragerc probably need to be updated, as described here: https://coverage.readthedocs.io/en/7.2.5/migrating.html

[UsamaSadiq]

Created PR https://github.com/openedx/edx-django-utils/pull/308 with the suggested fix that resolved the coverage drop issue.