Update MembershipType.duration and MembershipStatus.name to be required

[eileenmcnaughton]

This updates these fields to be required as that appears to be the case.

We could alternatively go with a default of 'month' for
MembershipType.duration_unit

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[eileenmcnaughton]

@seamuslee001 does this seem straight forward to you?

[seamuslee001]

This seems fine to me merging