* Clean up imports
* Clean up whitespace
* Use drop collection function from helpers
* Use parameterized integration tests to test on_disk variations
* Promote on_disk_vectors parameter into dedicated fixture
* Merge basic retrieve test with parameterization
* Flatten functions
* Split validation test functions
* Don't parameterize on_disk states when testing validation
* Parameterize init_from_collection test sequence
* Parameterize on_disk_payload in tests with fixture
* Parameterize new batch update tests
* Fix integration test collection setup distance after incorrect merge
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