Fix upgrade job

The argocd upgrade job was failing in Big Bang CI

Needed to remove the .Values.istio.injection from the conditional wrapped around the logic for killing the istio sidecar container

This value isn't present in the argocd chart, and was causing it to not render out and execute, causing the istio sidecar to stick around and the job to not complete, causing the helm release to fail.

Here's the pipeline now with the job running and terminating successfully - https://repo1.dso.mil/platform-one/big-bang/bigbang/-/pipelines/1084410