Custom Image deployment fixes and Q2 2025 updates

[danycontre]

Overview/Summary

Replace this with a brief description of what this Pull Request fixes, changes, etc.

This PR fixes/adds/changes/removes

1. AVM modules update
2. OS marketplace image selection logic re-designed
3. AZ.Accounts and Az.ImageBuilder versions updated

Breaking Changes

1. Parameters removed:

• operatingSystemImage

3. New parameters:

• mpImageOffer
• mpImageSku
• mpImagePublisher
• mpImageVersion

Testing Evidence

Replace this with any testing evidence to show that your Pull Request works/fixes as described and planned (include screenshots, if appropriate).

As part of this Pull Request I have

• Read the Contribution Guide and ensured this PR is compliant with the guide
• Ensured the resource API versions in .bicep file/s I am adding/editing are using the latest API version possible
• Checked for duplicate Pull Requests
• Associated it with relevant GitHub Issues
• (AVD LZA Team Only) Associated it with relevant ADO Items
• 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 (e.g. Contribution Guide, Module READMEs, Docs etc.)