New Brownfield Scenario: Custom Image Template Prerequisites

[jamasten]

Overview/Summary

The Custom Image Template Prerequisites solution enables customers to easily begin using Custom Image Templates without having to fumble around in the documentation. It creates the required resources for any scenario.

Testing Evidence

The code was tested 3 times in Azure Cloud:

As part of this Pull Request I have

• [X] Read the Contribution Guide and ensured this PR is compliant with the guide
• [x] Ensured the resource API versions in .bicep file/s I am adding/editing are using the latest API version possible
• [X] Checked for duplicate Pull Requests
• [X] Associated it with relevant GitHub Issues
• [ ] (AVD LZA Team Only) Associated it with relevant ADO Items
• [X] Ensured my code/branch is up-to-date with the latest changes in the main branch
• [X] Performed testing and provided evidence.
• [X] Updated relevant and associated documentation (e.g. Contribution Guide, Module READMEs, Docs etc.)

[jamasten]

Testing validation after API version updates:

[jamasten]

Testing validation after updates based on contributor's guide:

[danycontre]

@jamasten thanks for your contribution.

@swathibhat1 let's please create and ADO item to update code on this PR to use AVM.