Moving to `uv` instead of `poetry`. (#2919)
* Moving to `uv` instead of `poetry`.
More in the standard, faster, seemingly better lockfile.
* Creating venv if not created.
* Create the venv.
* Fix ?
* Fixing the test by activating the environment ?
* Install system ?
* Add the cli entry point.
* docker install on system
* Monkeying this...
* `--system` is redundant.
* Trying to force-include this pb folder.
* TRying to check that pb is imported correctly.
* Editable install necessary ?
* Non editable?
* Editable it is.
