remove epidemic week formatting requirements for CDF category values

[elray1]

I just noticed that the schema requires that the CDF values are either numeric or are strings in the format of an epidemic week, e.g. "EW202204". I don't think there's a reason to impose this formatting requirement, though -- one could imagine collecting CDF predictions for an ordinal categorical variable other than epidemic weeks with strings naming the categories that don't match that format.

For example, looking here: https://github.com/Infectious-Disease-Modeling-Hubs/schemas/blob/2e79b13d309168824bcca7ef716ebeb9aa3cda44/v3.0.0/tasks-schema.json#L948-L953

[annakrystalli]

Quick question, we want min and max removed also right?

schemas/v3.0.0/tasks-schema.json

Lines 951 to 952 in 2e79b13

	"minLength": 8,
	"maxLength": 8

[elray1]

yeah, i agree that it makes sense to remove those too