This check was previously only running on PRs to master, which makes it annoying to stack PRs and have all the checks run. Update it so that the check runs on all PRs and on pushes to master.
This code does not have any dependencies that are specific to any specific
version of ubuntu. So instead of testing on a specific version and then needing
to do work to keep the versions up-to-date, we switch to the ubuntu-latest
target which should be sufficient for testing purposes.
This work is being done as a part of https://github.com/openedx/platform-roadmap/issues/377
closes https://github.com/openedx/edx-platform/issues/35314
