Figure out how to run playwright based robot framework tests on nodes

[gforcada]

One of the main differences between selenium and playwright is that the later downloads and primes specific browser versions to ensure the communication between the browser and playwright is smooth as silk 🧵 while the former grabs what's available on the system 🎲 , which might not be compatible 😱

That means, though, that from a CI perspective, we need to ensure that playwright is initialized properly, and not only once, but any time that playwright version (or rather robotframework-browser version gets bumped).

See the installation instructions.

We probably want to install browsers in a central location and keep updating them. If the upgrade option is a no-op whenever the browser is the same, then we can do a first manual installation of the browsers and then run the upgrade command on every run? 🤔

Part of plone/Products.CMFPlone#3813