…'ERROR' (#6235)

Addresses an issue where a subscription, on encountering a fatal exception, causes the coordinator to transition to 'DOWN'. This leaves the component marked as 'DOWN' instead of 'ERROR', which means it will not be restarted by K8s.

CORE-19976 Prevent components from being marked as 'DOWN' instead of 'ERROR'

…6270)

This change prevents a lifecycle component from moving from `ERROR` state to `UP` or `DOWN`. It should not be possible to do this, but it was observed that competing threads could achieve it through a race condition.

…08-28