[MCCS-2030] Pull antenna position data from telmodel into core MCCS on init

Worked to try pull telmodel data into our helmfile.yaml file to allow us to directly access from telmodel.

I attempted to use the built in hooks in helm to try to populate the files direct into the manifests on running a helm sync command. Unfortuantly this doesn't work as none of the hooks run before the manifests are loaded (a failing of the hooks imo). As a result it would fail if the file didn't exist before running the command, and if it did succeed, it would use the outdated version.

As a result this is a compromise that means you have to run the fetch script first. It should run the fetch script every time you sync or destroy the deployment though so hopefully will remain up to date.