Revert "Wiring user identities"

[jsturtevant]

This reverts commit 8dc7bb1.

This is passing for ws2022 but started failing in ws2019 with E0802 14:31:52.114636 6048 kuberuntime_manager.go:269] "Failed to register CRI auth plugins" err="plugin binary directory /var/lib/kubelet/credential-provider did not exist"

also seeing some interesting errors in logs:

b1d0a36836c1","Type":"ContainerStarted","Data":"34516e609fce5ffa186d271994a9288502d1a52e440cb9ca51a309d5520b6eea"}
E0802 17:18:50.454190    4912 log.go:32] "PullImage from image service failed" err="rpc error: code = NotFound desc = failed to pull and unpack image \"e2eprivatecommunity.azurecr.io/alpine:3.7\": failed to resolve reference \"e2eprivatecommunity.azurecr.io/alpine:3.7\": e2eprivatecommunity.azurecr.io/alpine:3.7: not found" image="e2eprivatecommunity.azurecr.io/alpine:3.7"
E0802 17:18:50.755482    4912 log.go:32] "PullImage from image service failed" err="rpc error: code = Unknown desc = failed to pull and unpack image \"e2eprivatecommunity.azurecr.io/alpine:3.7\": failed to resolve reference \"e2eprivatecommunity.azurecr.io/alpine:3.7\": failed to authorize: failed to fetch anonymous token: unexpected status from GET request to https://e2eprivatecommunity.azurecr.io/oauth2/token?scope=repository%3Aalpine%3Apull&service=e2eprivatecommunity.azurecr.io: 401 Unauthorized" image="e2eprivatecommunity.azurecr.io/alpine:3.7"
E0802 17:18:50.755904    4912 kuberuntime_manager.go:1272] "Unhandled Error" err="container &Container{Name:image-pull-test,Image:e2eprivatecommunity.azurecr.io/alpine:3.7,Command:[/bin/sh -c while true; do sleep 1; done],Args:[],WorkingDir:,Ports:[]ContainerPort{},Env:[]EnvVar{},Resources:ResourceRequirements{Limits:ResourceList{},Requests:ResourceList{},Claims:[]ResourceClaim{},},VolumeMounts:[]VolumeMount{VolumeMount{Name:kube-api-access-2fl6v,ReadOnly:true,MountPath:/var/run/secrets/kubernetes.io/serviceaccount,SubPath:,MountPropagation:nil,SubPathExpr:,RecursiveReadOnly:nil,},},LivenessProbe:nil,ReadinessProbe:nil,Lifecycle:nil,TerminationMessagePath:/dev/termination-log,ImagePullPolicy:Always,SecurityContext:nil,Stdin:false,StdinOnce:false,TTY:false,EnvFrom:[]EnvFromSource{},TerminationMessagePolicy:File,VolumeDevices:[]VolumeDevice{},StartupProbe:nil,ResizePolicy:[]ContainerResizePolicy{},RestartPolicy:nil,} start failed in pod image-pull-teste6f5f010-1cbc-416c-a4fd-82d2361bb2de_container-runtime-2696(fb7746e7-1a03-4678-93c5-b1d0a36836c1): ErrImagePull: [rpc error: code = NotFound desc = failed to pull and unpack image \"e2eprivatecommunity.azurecr.io/alpine:3.7\": failed to resolve reference \"e2eprivatecommunity.azurecr.io/alpine:3.7\": e2eprivatecommunity.azurecr.io/alpine:3.7: not found, failed to pull and unpack image \"e2eprivatecommunity.azurecr.io/alpine:3.7\": failed to resolve reference \"e2eprivatecommunity.azurecr.io/alpine:3.7\": failed to authorize: failed to fetch anonymous token: unexpected status from GET request to https://e2eprivatecommunity.azurecr.io/oauth2/token?scope=repository%3Aalpine%3Apull&service=e2eprivatecommunity.azurecr.io: 401 Unauthorized]" logger="UnhandledError"

While we investigate, to unblock the release-informing job we will revert this.

/assign @marosset @ritikaguptams

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[marosset]

/lgtm