Revisit integer ordinal constraints for map marker overlay

[bobular]

          We need to revisit this. There might be lower-cardinality integer ordinal variables that DO have vocabularies, and these might be OK to use as marker overlays (as continuous or categorical though?)

Originally posted by @bobular in VEuPathDB/service-eda#29 (comment)

We may be able to use the min/max distinct values count constraints but need to check how the client handles these variables as marker overlays. Hence I've put it in web-monorepo for now.

[bobular]

I've had a look and I don't think there is a low-cardinality integer ordinal (perhaps 'year') variable in a mappable study on clinepi to test this with. Going to label as 'paused'.

[bobular]

As per #761 (comment)

I don't think we're going to get low-cardinality integer ordinals. They will be integer continuous hopefully.

The only integer ordinals might be ID variables that got forced at load time to be ordinal?