XML Diff: search for an existing report by swrs_report_id via relay

[dleard]

We are currently fetching all ids & doing an array.find() on the swrs_report_id
This could probably be done with a filter in the relay query.
I think this would entail changing the two ReportSelector components into a single fragment container with two allReports targets (left/right side) which use the swrs_report_id in the router query string to filter and return the proper report.