[TRI-5431] bug: [v4] queues get unpaused during deploy

[matt-aitken]

In version 4 you can pause queues (from the dashboard or via the SDK).

Pausing sets a flag on TaskQueue in postgres and it also adjusts sets the concurrencyLimit of the queue to zero in Redis.

When deploys happen we aren't checking if a TaskQueue is paused, we're just setting the concurrencyLimit like normal from the deploy. This unpauses the actual queue processing but leaves the TaskQueue status as paused.

_TRI-5431