[VAS-1167] feat: checks for legacy cart on helpdesk functions

[alessio-cialini]

List of Changes

• Introduced checks for legacy cart
• Updated unit testing
• Updated integration test model

Motivation and Context

https://pagopa.atlassian.net/browse/VAS-1167

How Has This Been Tested?

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 not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[github-actions]

Comment this PR with update_code to update openapi.json and format the code. Consider to use pre-commit to format the code.

[sonarcloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
85.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud