RunData cleanup

[gyorb]

RunData api type should be cleaned up.

• [ ] 5: i64 resultCount, can be removed if the new report counting api is available in #839
• [ ] 7: optional bool can_delete can be removed when report removal will be cleaned up

[csordasmarton]

I think this problem has already been solved. https://github.com/Ericsson/codechecker/blob/1af4908d085c98375ef5ef7da0cdb640623f6567/web/api/v6/report_server.thrift#L149-L160

We removed the can_delete attribute but we kept the resultCount to show the number of unresolved reports in the Run List page.