repo_map report as json data

Currently the report only generates html. For easy consumption by other applications, json would be a better fit.

Related to work being done to close off direct access to the S3 bucket, where we will need to consume the data from another application to display it. https://dccscr.dsop.io/dsop/redhat/scanning-reports/reportengine/issues/7

Acceptance Criteria

A valid JSON file is produced containing the same information as the report, but without the html markup.