Backport of CSI: node drain should end once only plugins remain into release/1.3.x #12856
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Backport
This PR is auto-generated from #12846 to be assessed for backporting due to the inclusion of the label backport/1.3.x.
The below text is copied from the body of the original PR.
Fixes #12835
In #12324 we made it so that plugins wait until the node drain is
complete, as we do for system jobs. But we neglected to mark the node
drain as complete once only plugins (or system jobs) remaining, which
means that the node drain is left in a draining state until the
deadline
time expires. This was incorrectly documented as expectedbehavior in #12324.
The new behavior shipped in 1.3.0-beta.1 but not yet in GA, so depending on when this can get merged we might not need a changelog entry for this one.