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## Problem `wait_for_active_tenant()`, used when starting background tasks, has a race condition that can cause it to wait forever (until cancelled). It first checks the current tenant state, and then subscribes for state updates, but if the state changes between these then it won't be notified about it. We've seen this wedge compaction tasks, which can cause unbounded layer file buildup and read amplification. ## Summary of changes Use `watch::Receiver::wait_for()` to check both the current and new tenant states.