* PM-11945 - Rename RegisterUserWithOptionalOrgInvite to RegisterUserViaOrgInvite as the org invite isn't optional in the function - just the overall process of registration.
* PM-11945 - Yet another rename
* PM-11945 - Wire up call to RegisterUserViaOrgSponsoredFreeFamilyPlanInviteToken and test.
* PM-11945 - RegisterUserCommandTests - test new method
* PM-11949 - Rename tests
* PM-11945 - AccountsControllerTests.cs - add integration test for RegistrationWithEmailVerification_WithOrgSponsoredFreeFamilyPlanInviteToken_Succeeds
* PM-11945 - Adjust naming per PR feedback to match docs.
* PM-11945 - More renaming