Automatic merge from submit-queue

Critial pod test uses allocatable instead of capacity

This solves #42239.

When this test was first introduced, pods could request up to the capacity of the node.
With the addition of allocatable introduced in #41234, this is no longer the case, and pods can only use up to allocatable.

This should be included in 1.6, as it is a bug related to a 1.6 feature.

cc @vish @yujuhong