kobotoolbox / kpi / 23580177676

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fix(qual): fix flaky throttling tests caused by global cache clearing in parallel CI (#6866)

### 📣 Summary
Fix flaky automatic QA throttling tests by removing global
`cache.clear()` and deleting only the user-specific throttle cache key.

### 📖 Description
The tests were using `cache.clear()` to reset the throttle state before
each test. When running tests in parallel (pytest -n auto) on CI,
multiple workers share the same Redis cache. Clearing the entire cache
in one worker could remove throttle state used by another worker,
causing inconsistent test results.

The Fix: Switched to
`cache.delete(f'throttle_automatic_qa_{self.asset.owner.id}')`. This
ensures each test worker only manages the cache state relevant to its
own execution context without interfering with others.

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