Add GTFS-RT validation errors to reports

[evansiroky]

Is your feature request related to a problem? Please describe.

Include a list of GTFS-Realtime validator errors that are found when publishing the reports website.

Describe the solution you'd like

Somewhere, a list of the GTFS Realtime validator errors could be added similar to those shown for the GTFS Schedule validator.

Describe alternatives you've considered

Not include them.

Additional context

Screenshot of GTFS Schedule Validation Errors: