Update PIM-G to align with Role Eligibility

[mpoulson]

Pull Request (PR) description

• Update PIM-G to align with Role Eligibility and allow UPN for users
• work with owner (and not just member)
• fix bugs with multi schedules per group

This Pull Request (PR) fixes the following issues

• Fixes AADGroupEligibilitySchedule should not use DisplayName as key #5800

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.

[M365DSCApprover]

This would be a breaking change, meaning the soonest we could release it would be during the first week of October.

[mpoulson]

@NikCharlebois - Given this resource was fairly badly broken I find it hard to believe it was used much if at all. Is there a logic path to use the telemetry collected to determine if this breaking change would actually be impactful before October?

The existing resource

1. Didn't support >1 assignment per group
2. Only supported member assignments not owner

It isn't a blocker for me if not, just hoping to not have to do custom patches on my local builds for a few months.