get https://api.flextract.dev/api/v1/report-instances//json/
Get JSON data for a report instance.
If the report instance is completed, returns the same JSON object that is injected into the HTML report,
with properly mapped keys for each tile. The data is retrieved from the data-model-schema-instances
associated with the report instance.
If the report instance is not completed, returns the report instance data with status information.
