refactor(test): Extract Test models into dojo/test/ module [2/10]

[valentijnscholten]

Stacked PRs

This is one of a stacked series that reorganizes dojo/ into self-contained dojo/{module}/ packages (matching the dojo/url/ reference). They are stacked — each PR is based on the previous one — so review and merge bottom-up in this order:

1. refactor(product_type): Extra ProductType models into dojo/product_type/ module [1/10] #14970 — product_type
2. refactor(test): Extract Test models into dojo/test/ module [2/10] #14971 — test ◀ this PR
3. refactor(engagement): Extract Test models into dojo/test/ module [3/10] #14972 — engagement
4. refactor(product): Extract Product module into dojo/product/ [4/10] #14973 — product
5. refactor(finding): Reorganize finding into self-contained dojo/finding/ package [5/10] #14974 — finding (+ CWE & BurpRawRequestResponse fold-in)
6. refactor(reorg): extract user + system_settings modules [6/10] #14981 — peripheral: user + system_settings
7. refactor(reorg): extract endpoint + tool_type/tool_config/tool_product modules [7/10] #14982 — peripheral: endpoint + tool_type/tool_config/tool_product
8. refactor(reorg): extract survey + benchmark modules [8/10] #14983 — peripheral: survey + benchmark
9. refactor(reorg): extract notes/note_type/file_uploads/reports/risk_acceptance [9/10] #14986 — peripheral: notes/note_type + file_uploads + reports + risk_acceptance
10. refactor(reorg): extract regulations/banner/announcement/development_environment/object [10/10] #14987 — peripheral: regulations + banner + announcement + development_environment + object

Merge #14970 first; each following branch is rebased onto the updated base and merged in turn. PRs 6–10 (draft, head branches on the DefectDojo upstream repo) continue the stack on top of #14974 — full implementation brief is the Phase 10 section in AGENTS.md.

Summary

Fully reorganizes the Test domain into a self-contained dojo/test/ package — models, services, UI, and API.

• Models: Test, Test_Type, Test_Import, Test_Import_Finding_Action + admin into dojo/test/{models,admin}.py; string FK refs; IMPORT_* constants single-sourced + re-exported. No migration change.
• Services: extract the test copy workflow (clone into engagement + grade recalc + notification) into an HTTP-free copy_test(test, engagement, user) service; view thinned; unit test added.
• UI: forms → ui/forms.py (TestForm re-exported since engagement uses it); test-domain filters (TestImportFilter, TestImportFindingActionFilter, TestTypeFilter) → ui/filters.py keeping DojoFilter bases (re-exports omitted to avoid cycle; consumers updated). EngagementTest* filters left for the engagement module. Views + urls → ui/.
• API: 8 Test-domain serializers → api/serializer.py (TestSerializer re-exported for reports; rest omitted); ApiTestFilter/TestImportAPIFilter → api/filters.py; TestsViewSet/TestTypesViewSet/TestImportViewSet → api/views.py; api/urls.py adds add_test_urls() preserving routes tests/test_types/test_imports + basenames. Finding* serializers left in place.

Verified: manage.py check, makemigrations --check (no changes), ruff, copy/apply-template tests, and the full rest_framework suite (871 tests).