Refactor: func setup should utilize meta packages

### Description

Currently, func setup hardcodes the list of workloads to install for a given 'feature'. This was done for preview, but before GA this needs to switch to using meta packages.

Start by locating the func setup entry point and tracing where it hardcodes the workloads installed for a feature. Read the existing setup and package-handling flow, then identify how meta packages are represented. Done means setup uses meta packages instead of the hardcoded workload list and installs the intended workloads.

Written by the indexing model from the issue text.