Set up a CI job to run codeCoverage tests

We do not currently run automated code coverage report generation in CI. It would be worth setting up a job to run this weekly. I imagine all the tests will need to be run on the same node unless we get aggregation to work and that is why I am thinking it will be a new job rather than a modification of the existing job (which runs different parts of the build in parallel on different nodes).

If we were to get aggregation to work it may be possible (if it doesn't add much time to the build) to run this profile in CI.

We should also determine suitable coverage metrics to aim for.