- Removed static UUIDBackfillTask initializer and removed the
registration from AppDelegate. Kicking off the task will be handled
with IOS-631.
- Moved the async perform work to its own function
- Some minor syntactic changes
- Updated database fetch to retrieve empty string UUIDs
- Handles non-e164 numbers fetched from database
- Leverages the MockSSKEnvironment to deal with the shared
SignalServiceAddressCache. Removes added test support.
- Add tests to exercise new functionality
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