🧪 [DashboardSurveyOutboxStore] Add multiple entries delete test

[dogi]

🎯 What: The testing gap addressed
The deleteEntry method in DashboardSurveyOutboxStore only had a test for deleting a single entry from a database with just that one entry. It didn't verify that it correctly deleted only the specific entry when multiple entries were present.

📊 Coverage: What scenarios are now tested
A new test deleteEntry_withMultipleEntries_removesOnlySpecifiedEntry has been added. It populates the SQLite database with multiple outbox entries, executes the deletion for a specific ID, and then verifies that:

1. The deletion returned true.
2. The specific entry was successfully removed.
3. The other independent entry remained untouched.

✨ Result: The improvement in test coverage
The test coverage for DashboardSurveyOutboxStore.deleteEntry is now more comprehensive and correctly validates the SQL WHERE id = ? logic against unintended side-effects.

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PR created automatically by Jules for task 8653509991303777113 started by @dogi

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