Resolve an rpId.

Present a potential FIDO origin to see if it matches one or more configured relying parties.

Entitlements:
- manageEnrollMFAMethodAnyUser (Manage second-factor authentication enrollment for all users)
- manageEnrollMFAMethod (Manage own second-factor authentication enrollment)
- authnAnyUser (Authenticate any user)
- authn (Authenticate self)

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