Automatically add comment to PR that requires maintainer to review and rerun integration tests

[chuckwondo]

As a follow-on to Allow maintainers to run integration tests on PR from a fork, it would be very convenient to enhance the GitHub integration-tests workflow to post a comment to the PR when it requires a maintainer to perform a security review and re-run the tests, and the comment should include a link to the GitHub page for the failed integration tests build, where the maintainer can then click the "Rerun" button.

While a maintainer can currently see failed builds and navigate to them to hit the Rerun button, adding a comment to the PR would make the needed action visible in the PR itself.