Fix the request parameters in the QueryTemporalEvolutionOfEntities TCs

When requesting with a type, an attribute or else an id, a list is used instead the expected comma-separated list.

See for instance in 021_01:

    @{entity_types_to_be_retrieved}=  Create List   Vehicle

Instead the entity types should be prepared like this:

    ${entity_types_to_be_retrieved}=  Catenate    SEPARATOR=,     Vehicle