Merge branch '406633-add-explain-this-vulnerability-experimentation-api' into 'master'

Add "explain this vulnerability" feature to vuln details page

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/117667



Merged-by: David Pisek <dpisek@gitlab.com>
Approved-by: Samantha Ming <sming@gitlab.com>
Approved-by: David Pisek <dpisek@gitlab.com>
Co-authored-by: Daniel Tian <dtian@gitlab.com>