[1.2] Group validation errors by type

[robredpath]

• We already have identifiers for each kind of check
• The work here is to categorise them and present them together
• Risk is that ungrouped errors disappear

[robredpath]

https://docs.google.com/document/d/1Jy0kbX7OhP5aY_j67VgTJe9mYcn8iuP3I6ahetfz9OE/edit#bookmark=id.pridbg17tk0 is @mrshll1001 's prototype for this

[Bjwebb]

We already have identifiers for each kind of check

I think I said this. I'm referring to e.validator and e.validator_valuewhich we have for each error e from jsonschema. e.g. for missing fields, e.validator is required, so we can match for that.

The validation grouping prototype looks good to me.

[Bjwebb]

I've split validation errors into 3 groups. Check out the demo dev deploy.

Currently modals are broken. How best to fix that depends on how much more we're changing the tables. The prototype docs only has two columns - is that what we want, or is it just shorthand for the larger table?