[CI] `functional_tests` jobs failing due to insufficient CPU

Summary

We're noticing pipelines fail during the functional_test jobs because it timed out waiting for the Deployments to be in Running state. This is because the pods are Pending due to insufficient CPU:

0/6 nodes are available: 3 Insufficient cpu, 3 node(s) had taint {node-role.kubernetes.io/master: }, that the pod didn't tolerate.

From what I've noticed, this happens when there are 3 or more simultaneous releases running. Also, the 4.7 cluster has this problem more often because it only has 5 notes compared to the 4.6 clusterwhich has 6 nodes.

Example failed job