Add project id foreign key to data sources tables.

[blkt]

Summary

Tables data_sources_functions and rule_type_data_sources added by migration 108 lacked a reference to their containing project.

This change adds project_id foreign key in the style of rule_instances in order to avoid future mistakes like exposing resouces by id to users that don't have rights on the containing project.

Change Type

• [X] Bug fix (resolves an issue without affecting existing features)
• [ ] Feature (adds new functionality without breaking changes)
• [ ] Breaking change (may impact existing functionalities or require documentation updates)
• [ ] Documentation (updates or additions to documentation)
• [ ] Refactoring or test improvements (no bug fixes or new functionality)

Testing

Manually ran migrate up and migrate down in a database containing a few records. The aim of the test was to verify that the calculated project id was correct.

Review Checklist:

• [X] Reviewed my own code for quality and clarity.
• [X] Added comments to complex or tricky code sections.
• [ ] Updated any affected documentation.
• [ ] Included tests that validate the fix or feature.
• [X] Checked that related changes are merged.

[coveralls]

coverage: 54.63% (+0.003%) from 54.627% when pulling cedff5154a143bc2a064e64d2e51643ed3307c33 on fix/data_sources_migration_project_id into c8469dde13c5e470005702f48b739f73ca5d31a0 on main.