Remove MS.TEAMS.3.1 Skype is now retired

[buidav]

Prerequisites

• This issue has an informative and human-readable title.

💡 Summary

Set-CsTenantFederationConfiguration -AllowPublicUsers $true is failing in the teams functional test.
This corresponds to the retiring of Skype last week

The AllowPublicUsers value in the Get-CsTenantFederationConfiguration is now null.

The EnablePublicCloudAccess field in Get-CsExternalAccessPolicy is also null. https://learn.microsoft.com/en-us/microsoftteams/external-meetings-skype-for-business-server-hybrid

This issue is to remove MS.TEAMS.3.1 as Skype is now truly gone.

Motivation and context

Remove SCuBA policy that no longer applies to M365 tenants.

Implementation notes

1. Remove MS.TEAMS.3.1v1 from the baselines.
2. Remove MS.TEAMS.3.1v1 from the Rego
3. Remove any cmdlets in the Teams Provider if it's no longer needed.
4. Queue MS.TEAMS.3.1v1 to be removed from BOD 25-01 Required Configurations Website
5. Add MS.TEAMS.3.1v1 to the removed policies markdown in our repo

Acceptance criteria

• MS.TEAMS.3.1 no longer exists in both our repo and any places in SCuBA