Hi Team,

Cluster upgrade gets stuck due to Istiod pod eviction failure.

Error Logs:
~~~
0421 21:25:35.698305 1 drain_controller.go:153] evicting pod istio-system/istiod-75fb5f5bc5-t6sxk
E0421 21:25:35.704421 1 drain_controller.go:153] error when evicting pods/"istiod-75fb5f5bc5-t6sxk" -n "istio-system" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
I0421 21:25:40.705802 1 drain_controller.go:153] evicting pod istio-system/istiod-75fb5f5bc5-t6sxk
E0421 21:25:40.718039 1 drain_controller.go:153] error when evicting pods/"istiod-75fb5f5bc5-t6sxk" -n "istio-system" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
I0421 21:25:45.720883 1 drain_controller.go:153] evicting pod istio-system/istiod-75fb5f5bc5-t6sxk
E0421 21:25:45.726975 1 drain_controller.go:153] error when evicting pods/"istiod-75fb5f5bc5-t6sxk" -n "istio-system" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
[quickcluster@upi-0 ~]$ oc get pdb -n istio-system
~~~

Reproducer Steps:

1. Install ServiceMesh 3 on OCP 4.18.x
2. Create Istio and IstioCNI resource
3. Upgrade cluster to any 4.18 z stream