Ensure Test-Mgcommand prerequisites is v1.0 and beta compatible

[robbieveivers]

Fixes #70

Changes proposed in this pull request

• Added Back and confirmed that Beta Commands are returned via Find-MgGraphCommand which is part of microsoft.graph.authentication v1.0 module Beta uses this v1.0 module as well

Testing

Updated pester tests for Test-MgCommandPrerequisites

Tested the Get-MsIdCrossTenantAccessActivity command e2e manually

Documentation

• [x] All exported commands have Synopsis, Parameter Descriptions, and at least one Example.