Clone vulnerability list and move vulnerability counts component

What does this MR do and why?

This MR does 2 things:

1. vulnerability_list.vue and its test was cloned in a new vulnerability_report folder. We are refactoring the report to be more reusable, but there are enough changes that it would be difficult to fit them in the existing report. Thus, the file was cloned into a new folder. It will be modified in a follow-up MR so that the diff is usable rather than making every line look like it's new.

2. vulnerability_counts.vue was also moved to the new vulnerability_report folder.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #338790 (closed)