Context:
The endpoint https://confluence.camunda.com/display/CO/Variables#Variables-GetListofvariablenamesforalistofreportIDs allows to obtain variable names for a set of reports. Currently this endpoint does only consider the first definition of each report but actually should consider all definitions present in a report.

AT:

• the endpoint https://confluence.camunda.com/display/CO/Variables#Variables-GetListofvariablenamesforalistofreportIDs returns all variables names for reports with multiple definitions
• same applies for the values endpoint