PTEUDO-1652 convert deprecated annotations

[drewwells]

As part of 1.10 a number of changes were made to mutating webhooks
for better resiliency of the k8s clusters. One drawback is a
number of apps would no longer get sidecars.

This introduces the same dangerous webhook as before but only to
convert the pods from old annotation syntax to new label syntax.
Removes redundant webhook tests from controller, it's too difficult
standing up a manager to bind the mutating webhooks to.