kubectl impersonation (e.g. kubectl --as) does not work through infra connector

[BruceMacD]

Describe the bug

An impersonated user/group specified through kubectl commands is ignored and the command is run as the current user logged in to Infra.

# in this example, I am logged in to Infra as a user that has cluster-admin access to a cluster
# this command should fail, because the "unknown" user does not exist

kubectl create secret generic impersonation-test-secret --from-literal=super-secret=sEcReT --namespace infrahq --as=unknown
impersonation-test-secret created

# the command succeeds because it as run as the user logged into infra

Expected behavior

The command is run as the impersonated user if the user logged into Infra has the appropriate permissions to impersonate that user.

kubectl create secret generic impersonation-test-secret --from-literal=super-secret=sEcReT --namespace infrahq --as=unknown
error: failed to create secret secrets is forbidden: User "unknown" cannot create resource "secrets" in API group "" in the namespace "infrahq"

Environment

$ infra version
 Client: 0.12.2
 Server: 0.12.2

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"22", GitVersion:"v1.22.5", GitCommit:"5c99e2ac2ff9a3c549d9ca665e7bc05a3e18f07e", GitTreeState:"clean", BuildDate:"2021-12-16T08:38:33Z", GoVersion:"go1.16.12", Compiler:"gc", Platform:"darwin/arm64"}
Server Version: version.Info{Major:"1", Minor:"22", GitVersion:"v1.22.5", GitCommit:"5c99e2ac2ff9a3c549d9ca665e7bc05a3e18f07e", GitTreeState:"clean", BuildDate:"2021-12-16T08:32:32Z", GoVersion:"go1.16.12", Compiler:"gc", Platform:"linux/arm64"}

Additional context

Fixing this will require some changes to how the connector relays commands.

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