feat: add templating and custom config file to complete

[luke-taylor]

Overview/Summary

This PR introduces templating for the config file of the complete module. It also introduces the specific config file parameter.

This PR has a dependency on: Azure/ALZ-PowerShell-Module#100

This PR fixes/adds/changes/removes

1. Feature Request: complete module config updates #85

Breaking Changes

additional_files has been changed to a hidden input, so users will no longer be prompted fore this.

Testing Evidence

Will trigger e2e tests.

Ran an end to end test locally and here is the successful plan run with a custom config file, also tested with an empyy value for the config file and confirms it defaults to the config.yaml file as expected:

As part of this Pull Request I have

• Checked for duplicate Pull Requests
• Associated it with relevant issues, for tracking and closure.
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Performed testing and provided evidence.
• Updated relevant and associated documentation.

[jaredfholgate]

NOTE: Tests won't pass until Azure/ALZ-PowerShell-Module#100 is released. Will re-run once that is live.

[jaredfholgate]

LGTM. :)