core: tighten up core_observation_lab and _vital_signs inclusion

[mikix]

Require both these observation sub-type tables to use the proper category code and system.

Checklist

• Consider if documentation (like in docs/) needs to be updated
• Consider if tests should be added
• Update template repo if there are changes to study configuration

[mikix]

A thing I didn't do in this PR, but seems appropriate, is switching core__observation_vital_signs from including valueCodeableConcept fields to valueQuantity fields. I believe quantities are usually used for vital signs, not concepts.

[dogversioning]

saying this out loud so it's not just in my head - i think that at some point these two tables should move to a builder, i just didn't get to it due to aforementioned release deadlines.

[mikix]

saying this out loud so it's not just in my head - i think that at some point these two tables should move to a builder, i just didn't get to it due to aforementioned release deadlines.

When I add a component table (probably in that same file?), I'll add a comment to that effect.