refactor: always add values to constraints

[olav]

https://trello.com/c/MRIBNNFX/963-unleash-backend-include-values-from-the-unleash-client-api-as-an-empty-array

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St.❔	Category	Percentage	Covered / Total
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Test suite run success

824 tests passing in 118 suites.

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[FredrikOseberg]

Nice. I think we need to remove the min values from the constraint values schema though, because now that it can be an empty array we will include it in the response to the frontend. So create will work, because we don't pass the empty array on create - but when you edit you'll receive the empty array in the response from the backend and the validation will fail because of the minimum 1 item hard requirement on the constraint schema.

[FredrikOseberg]

I see you have accounted for this. LGTM!