Automate running end-to-end tests

[scale-tone]

We do have some Playwright-based end-to-end tests, but at the moment they are being run manually.

Need to automate the deployment of a test environment (multiple Function instances running DfMon in various different configurations: standalone, injected, inproc, isolated, server-directed auth, client-directed auth etc.) and then also automate running those tests against this environment.