Fix too fluid css rules inside object adding card

[otahontas]

Proposed solution

Object adding card (container component for xml upload and json based forms) is quite relaxed on how to show its children components. If one child spans as fullwidth, it reflects to all other children. Add some fixed limiters to rendering.

DoD (Definition of Done)

Children are rendered consistently

Testing

Unit tests

[otahontas]

We don't use object adding card anymore so this can be closed