related to https://gitlab.com/groups/cki-project/-/epics/97

The flag was introduced into kpet-db before there was a Data Warehouse, let alone the concept of "known issues" in it. Now that we have them, we can actually just use them to do the job of the "waived" flag. I.e. masking failing, generally-unreliable (e.g. newly-introduced) tests with precision on par with what kpet-db provides.

Jira: CKI-7102