chore: Use template function to set model PVC names

[YrrepNoj]

This PR updates our PVCs and Deployments to use a helper function to determine the name of the PVC based on the model and revision used in the Zarf Package.

This update buys us the ability to deploy multiple models to the cluster without clashing on the name of the PVC they were trying to use.

• Adds ZARF_CONFIG environment variable to our Make targets for when we build model Zarf packages.
  • This is necessary because the actions.before lifecycle hook needs certain templates applied so it can download the correct model weights at package-create-time.
  • This gives package creators the ability to choose a different model to bake into their package.

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[YrrepNoj]

This is stale. Will reopen once I pick this up again.