backport to 1.1.x: CSI: skip node unpublish on GC'd or down nodes

[tgross]

#13301 was supposed to have been backported to 1.1.x but there's no backport tag. Weirdly, #13311 refers to the code having been backported, and the test changes from #13301 are already here, just not the code changes. Not sure how that happened but #13301 was one of the PRs impacted by the weirdness around the 1.3.2 vs 1.3.5 release. In any case, this bug should get released in the next 1.1.x.

(2/2 PRs, the other was for 1.2.x)

[lgfa29]

Sorry, late to the party, but just to explain what seems to have happened:

• CSI: skip node unpublish on GC'd or down nodes #13301 didn't get backported
• remove unbackportable test #13311 references the wrong PR. The test that it removes (TestServiceSched_CSITopology) was added in CSI: no early return when feasibility check fails on eligible nodes #13274, not CSI: skip node unpublish on GC'd or down nodes #13301

[tgross]

Ah! Thanks @lgfa29! 😀

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