fix pypi publish job: install LFS, disable artifacts

Description

Related Issue

pypi job for a tag (https://gitlab.cta-observatory.org/cta-computing/dpps/qualpipe/qualpipe-webapp/-/jobs/576312) produced wrong version. This kind of version may appear if some files were changed after checkout.

It seems to be due to git LFS. I propose a change which needs to be tested with new RC tag if it's ok.

How Has This Been Tested?

• Pytest (python unit test)
• Mocha (js unit test)
• Playwright (js e2e test)

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation fix/update

Which subsystems are modified

• Backend
• Frontend
• Other (specify in the summary)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.