Breaking Change - Fix Access Review Definition ScopeValue Type

[FabienTschanz]

Pull Request (PR) description

This PR updates the format for the permission and resource scopes of the AADAccessReviewDefinition resource.
Usually, this could be considered a breaking change because it changes the structure of the object, but there was no possible way to create such an Access Review Definition in the GUI. The only way to create it now is through a feature that's still in preview, called Catalog Reviews - Multi Resource.

Because this is only preview for now and was not previously part of the experience, I believe this is justified to be changed. My test policies were not affected by this change and still contained the same definitions as before.

This Pull Request (PR) fixes the following issues

None.

Task list

• Added an entry to the change log under the Unreleased section of the file CHANGELOG.md.
  Entry should say what was changed and how that affects users (if applicable), and
  reference the issue being resolved (if applicable).
• Resource parameter descriptions added/updated in the schema.mof.
• Resource documentation added/updated in README.md.
• Resource settings.json file contains all required permissions.
• Examples appropriately added/updated.
• Unit tests added/updated.
• New/changed code adheres to DSC Community Style Guidelines.