Automatic merge from submit-queue (batch tested with PRs 43254, 43255, 43184, 42509)

Re-add kube_proxy to the abac file (Match what we had in 1.5).

**What this PR does / why we need it**:
Make the ABAC file match what it was in 1.5. GKE rewrites the ABAC file every time, so we were clobbering the kube_proxy entry that used to exist. This would have gone unnoticed, but a separate bug in GKE is causing the token file rewrites to fail on GKE (meaning group used in RBAC aren't there).

**Which issue this PR fixes**
fixes #42746

@liggitt @krousey