Follow-up from "Fix resolving cluster image scanning vulnerabilities"

The following discussion from !91121 (merged) should be addressed:

• @mikolaj_wawrzyniak started a discussion:

  nitpick (non-blocking): Referring to anonymous subject in it blocks is discouraged according to GitLab test guidelines https://docs.gitlab.com/ee/development/testing_guide/best_practices.html#subject-and-let-variables. However since this problem affects all specs in described #execute block, it can be solved in follow up MR/issue