Follow-up from "Fix sticky header on vulnerability reports"

The following discussion from !139118 (merged) should be addressed:

• @dpisek started a discussion: (+1 comment)

  When trying to test out the error state, I searched for the with-error class and only found one usage (selection_summary.vue:287). But it appears that it does not have the card class attached, so I have a feeling that the styling can be removed.

  Another pair of eyes would definitely help, just to double-check. If I am correct, then I'll tackle that in a follow-up 👍

The following discussion should also be handled: !139118 (comment 1688331988)