gracefulswitch, stub: remove last UpdateSubConnState references #6533
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UpdateSubConnState
error if called, and do that behavior directly in theStateListener
sUpdateSubConnState
field, which requires all tests that use it to useStateListener
s now (all migrated before this PR; requires balancer/weightedtarget: stop forwarding UpdateSubConnState calls #6525, included here as a separate commit).RELEASE NOTES: none