Bring test coverage back

[anneschuth]

Acceptance criteria

• Bring coverage to 95%
• Remove the #nocov in the codebase
• Add check for #nocov in ruff pre-commit hook
• Add the CI check the under limit of 95%
• out of scope: Test of integration of decision tree in the create-project-page #313

Implementation notes

• Heavy pain points are :
  • The Authorization (We need a OpenID Connect Mock)
    • Use pyvcr recording
  • The big project route