Implement guest mount for smb and afp

(Ticket: 2024013142000021)

This should be quite simple to implement, NetFSMountURLSync offers the option.

kNetFSUseGuestKey: Bool Login as a guest user.

Consider:

• How can one present a guest login for end users?
• How can one present a guest login for profile configuration?

Both are feasible and achievable.