* fix(mobile): retry the background backup when connectivity is restored
* return the backup result from the zone and drop the unrelated upload test
* flip the background worker bool to needsRetry
* decide the background retry from the upload callbacks
* run the background worker offline again and retry on reconnect with a separate connected gated request
* retry the background backup when any upload fails and keep one worker at a time
* always hand the retry to the connected worker and release the worker lock if startWork throws
* respect the charging only setting on the connected retry worker
Santo Shakil
3e2e8e0fe8