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Automatic merge from submit-queue (batch tested with PRs 41037, 40118, 40959, 41084, 41092) Switch CSR controller to use shared informer Switch the CSR controller to use a shared informer. Originally part of #40097 but I'm splitting that up into multiple PRs. I have added a test to try to ensure we don't mutate the cache. It could use some fleshing out for additional coverage but it gets the initial job done, I think. cc @mikedanese @deads2k @liggitt @sttts @kubernetes/sig-scalability-pr-reviews