Update Runner Helm chart docs to include list of deprecated fields (docs)
What does this MR do?
Update Runner Helm chart docs to include list of deprecated fields
Why was this MR needed?
In issues Regression since 0.42.1 - The job runners are f... (gitlab-org/charts/gitlab-runner#413) and Regression since 0.42.1 - `runners.namespace` c... (gitlab-org/charts/gitlab-runner#400) customers reported that there was a regression in the Runner Helm Chart since v0.42.1. On closer inspection, the reported regression is linked to functionality listed as deprecated in the Runner Helm chart.
The goal of this MR is to ensure that the information regarding the deprecated fields increases the likelihood that users and customers are made aware that these fields are deprecated and that there is a different method for passing those configuration parameters to a Runner on Kubernetes.