Part Test refactor

[SchrodingersGat]

This PR represents a major overhaul of the testing framework in preparation for the 1.0.0 release.

Prior to this change, the PartTestTemplate model was linked to a specific part. So if the user wanted to assign the "same" test to another part (say in a different category) then the template had to be duplicated.

The major change here is to decouple the PartTestTemplate model from the Part model - templates are now generic and can be reused. We then add the PartTest model which links a template to either a Part or PartCategory instance.

Link to Part

If a template is linked to a given part, then test results can be generated for any stock item of that part (or any variants of that part).

Link to Category

If a template is linked to a given category then test results can be generated for any part which lives under that category.

TODO

• Schema and data migrations
• Add migration testing
• Specific migration testing for consolidating duplicate templates
• Fix reverse migration issues
• Fix data fixtures for part tests
• Add API endpoints for new PartTest model
• Add data tables for viewing / editing / deleting the PartTest instances against a part
• Add function to determine the tests associated with a given part
• Add API endpoints for filtering PartTest by "part" instance (including inheritance from parent part or category)
• Update UI logic for viewing available tests against a given part
• Update UI logic for viewing available tests against a build order
• Update UI logic for viewing available tests against a stock item
• Fix "copy_tests_from" function on a Part instance
• Fix "copy test_results_from" function on a StockItem instance.
• Ensure test results are copied when serializing a stock item
• Ensure test results map / list / etc are properly available in a report template
• Fix existing unit tests
• Add new playwright tests
• Add new API unit tests
• Update CHANGELOG.md
• Update documentation around testing procedures
• Update demo dataset (data migration)
• Prevent duplicate PartTest entries for the same Part
• Allow override of tests based on part category levels
• Ensure correct order of operations for API filters on the PartTest endpoint - the for_part filter must apply first!1
• Allow certain parts to "exclude" tests which are inherited from above - perhaps a new model required here

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[SchrodingersGat]

Bumping to the next release target, a lot to think about here which I don't have time for