Resolve "Mimir Helm Template command gives ImportValues error"

General MR

Summary

This MR resolves an issue with how certain values are imported from the upstream chart.

The underlying problem is that these values are not defined in the upstream values.yaml but instead are defined in a .tpl

This solution will import the subchart .tpl file and use it's values, so that we do not have to redefine them.

Relevant logs/screenshots

(Include any relevant logs/screenshots)

Linked Issue

closes #37 (closed)

Upgrade Notices

(Include any relevant notes about upgrades here or write "N/A" if there are none)

Closes #37 (closed)