[KAFKA-19484] fix bug with tiered storage throttle metrics #20129
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Fixes a bug with tiered storage quota metrics introduced in
KIP-956.
The metrics tracking how much time have been spent in a throttled state
can stop reporting if a cluster stops stops doing remote copy/fetch and
the sensors go inactive.
This change delegates the job of refreshing inactive sensors to
SensorAccess. There's pretty similar logic in RLMQuotaManager which is
actually responsible for tracking and enforcing quotas and also uses a
Sensor object.