Chore: Getting started in Azure docs update

[bernardhalas]

Description

This section of the docs doesn't work anymore, seemingly due to the requirement of the Entra ID Premium tier. I suggest to rewrite this part of the docs to use more generic role for the Resource Group management privileges.

Ref:

Exit criteria

• Docs updated

[bernardhalas]

Perhaps the custom role can be replaced by Managed Application Contributor Role

[cloudziu]

I would personally leave the custom role part but mention that it requires a premium tier subscription. Additionally, add more generic example that don't require premium.