Automatic merge from submit-queue (batch tested with PRs 48365, 49902, 49808, 48722, 47045) Improve shared informer notification dispatching **What this PR does / why we need it**: Locks and channels don't play well together. This is an attempt to remove locks and only use channels in shared informer. It looks much cleaner to me. **Release note**: ```release-note NONE ``` @deads2k @ncdc
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