Revert "core: pass Subchannel state updates to SubchannelStateListene… #5684
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…r rather than LoadBalancer (#5503)"
This reverts commit 62b03fd.
Effectively reverts its follow-up commits:
dc218b6
405d8c3
44840fe
In order to fix #5676, we need to make a tweak to
SubchannelStateListenerand some other APIs. Since it has never been in any releases, it's better to avoid it in the upcoming 1.21 so that we don't have to deal with yet another migration.