[2298] Fix CI

[tjhunter]

Description

This PR should fix the CI issue. It makes several changes:

• update uv requirements (get fixes for resolution and workspace)
• introduce a sync-safe command that creates a venv in a more robust way. that should make sure that SCRATCH cache is touched and refreshed enough that it does not get cleaned
• fixes a number of issues when creating a new venv. these issues were hidden because of caching, they are now exposed every time by the CI.

Issue Number

Closes #2298

Checklist before asking for review

• I have performed a self-review of my code
• My changes comply with basic sanity checks:
  • I have fixed formatting issues with ./scripts/actions.sh lint
  • I have run unit tests with ./scripts/actions.sh unit-test
  • I have documented my code and I have updated the docstrings.
  • I have added unit tests, if relevant
• I have tried my changes with data and code:
  • I have run the integration tests with ./scripts/actions.sh integration-test
  • (bigger changes) I have run a full training and I have written in the comment the run_id(s): launch-slurm.py --time 60
  • (bigger changes and experiments) I have shared a hegdedoc in the github issue with all the configurations and runs for this experiments
• I have informed and aligned with people impacted by my change:
  • for config changes: the MatterMost channels and/or a design doc
  • for changes of dependencies: the MatterMost software development channel

[grassesi]

Tested the modified commands (sync-safe, lint) on Juptir: works fine. Note for people on Jupiter or juwels-booster who are using the uv package supplied by the module stack need to switch to standalone uv installation since the module stack only contains uv 0.7.4/0.8.17 . Alternatively we need to update the module stack.

[sophie-xhonneux]

This is a breaking change, let's wait until after June 10th when we present results.

[clessig]

This is a breaking change, let's wait until after June 10th when we present results.

What will be broken by this change?

[sophie-xhonneux]

From my understanding, it will force everyone to change their uv installation or be blocked and with insufficiently tested consequences. It is simply not worth doing this before June 10th