Automatic merge from submit-queue (batch tested with PRs 38171, 37968)

add QoS pod status field

Right now, applications retrieving pod information must reimplement the QoS classification logic on the client side if they wish to know the QoS class of the pod.

The PR adds the QoS class to the pod status so it can be used directly by clients.

This is a step toward addressing #33255

@ConnorDoyle @derekwaynecarr @vishh