Examples in `populate_reports.py` don't cover all the possible cases

[StevenMaude]

It's possible for reports to be:

• from the Bennett Institute, or owned by an organisation other than Bennett Institute
• hosted on the reports site, or on job-server

For local development, the only examples currently in populate_reports.py are Bennett Institute reports that are hosted on the reports site.

This made checking the admin filter change in 67d8ad4 more work: I had to create examples manually in the admin panel first, to confirm that the code change was correct.