Update minimum Helm version to 1.9.x
Summary
We should update our minimum supported Helm version to 1.9.x This is already our recommended Helm version, but our CI is currently running on 1.8 https://gitlab.com/gitlab-org/gitlab-build-images/blob/master/Dockerfile.gitlab-charts-build-base
The main reason I want us to upgrade is to be able to use the new before-hook-creation delete policy available in 1.9
This should allow us to clean up some of the problems we have with hooks failing and making it hard to install the chart again, as we can add deletion policies to hooks that we previously didn't because we wanted to keep failures around for debugging.