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 core: SubchannelStateListener continues to receive updates after LoadBalancer is shutdown. (#5883)

No more methods on the `LoadBalancer` will be called after
`LoadBalancer#shutdown()` is called.  This includes
`LoadBalancer#handleSubchannelState()` too.  `SubchannelStateListener`
inherited this restriction.  However, this special case makes
`onSubchannelState(SHUTDOWN)` an unreliable way of being notified
about `Subchannel` SHUTDOWN, and may confuse/complicate a
wrapping `LoadBalancer` that expects the full notification (e.g., #5875).

The javadoc isn't clear whether this restriction applies.  I think
it's more useful to make it no apply.

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