As I user I want to know about all vulnerabilities in my images, even if they are not categorized yet.

As part of the STONEINTG-425 story the clair-scan task has started surfacing the count of `unknown` severity level vulnerabilities in the `CLAIR_SCAN_OUTPUT` Tekton task result. Here is an example of the current format of the output:

{"vulnerabilities":{"critical":0,"high":28,"medium":70,"low":8,"unknown":1}}

This story is meant to cover exposing the new `unknown` field on the HAC UI side.