[FEAT] miwg-test-suite: do screenshots of all diagrams within the reference file #13
Description
Is your feature request related to a problem? Please describe.
Currently, we only do the screenshot of the first diagram. For a more complete coverage, we should do it for all diagrams of the file.
This requires bpmn-visualization support for this: process-analytics/bpmn-visualization-js#729
Additional context
Screenshots file name: in this case, the file name must contains the diagram index (see https://github.com/bpmn-miwg/bpmn-miwg-test-suite/#1-bpmn-miwg-import-test-procedure)