Enable Symbolicator for Sentry

We are having some trouble getting sourcemaps to work in Sentry: gitlab-org/gitlab#411547 (closed)

As described here, I believe it may be because Symbolicator is not enabled on our Sentry instance.

Unfortunately we can't go and simply enable it because the implementation in the Helm chart we're using is very naive and decidedly not production ready (e.g. no HPAs): https://github.com/sentry-kubernetes/charts/pull/213

So for this to work, we would need to:

• Contribute to the upstream Helm chart to harden up the Symbolicator manifests
• Enable Symbolicator once Helm chart is updated