Remove vulnerability report export button popover

On the vulnerability report, there is an export button with a popover:
ksnip_20221122-010344

This popover has been around for a while now and we no longer need to highlight it to users as a "new" feature. We should remove the popover. This was requested by @matt_wilson over Slack: https://gitlab.slack.com/archives/CV09DAXEW/p1668712751853219?thread_ts=1668711642.522619&cid=CV09DAXEW

Verification steps

  1. Go to a vulnerability report, for example this one: https://gitlab.com/gitlab-examples/security/security-reports/-/security/vulnerability_report

  2. If you've dismissed the export button popover before, run the following in the DevTools console to re-show it:

localStorage.removeItem('vulnerability_csv_export_popover_dismissed')
  1. Verify that the popover no longer shows.
Edited by Daniel Tian