Resolve "Increase width of left column in reports modal"

What does this MR do?

Increases the size of the left column on security &license report modals.

Similar to (https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/21048)

Are there points in the code the reviewer needs to double check?

Nope

Why was this MR needed?

To keep security reports and license reports in line with the CE reports.

Screenshots (if relevant)

Before

After

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Conforms to the code review guidelines
  • Has been reviewed by a UX Designer
  • Has been reviewed by a Frontend maintainer
• EE specific content should be in the top level /ee folder
• Conforms to the merge request performance guidelines
• Conforms to the style guides

What are the relevant issue numbers?

Closes #7128 (closed)