Map Variable field's validation message should be visible next to field

[PPiedel]

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Validation responses of MapVariable contains ExpressionParseErrors which are in fact related to field value, but the fieldName property of JSON response are filled as they were related to field key.

1. It should be clearly asocatied with value, not a key.
2. We should use uuid, because key edition leads to situatuion, where value error can not be associated with any key.

[lciolecki]

We should also add uuid for all nodes where where we have dynamic fields.