Feature Request: Add check for starter module existance

[jaredfholgate]

Is there an existing issue for this?

• I have searched the existing issues

Infrastructure as Code Type? (Required)

both

Starter Module? (Required)

not relevant

Use Case (Required)

The end to end tests do not fail when an invalid starter module name is supplied. Why not?

Proposed Solution (Required)

Add a validation check in ALZ PowerShell for starter module existence in the config file and / or folder.

Important Factoids (Optional)

Example: https://github.com/Azure/accelerator-bootstrap-modules/actions/runs/13771254224/job/38510167273?pr=80

References (Optional)

No response