Replace `button` with `gl-button`

Summary

Previously we encountered a UI bug because the .btn-link was removed from the code base. Below is the details for the original issue. This issue after !88967 (merged) has been merged, has been converted to migrate the button element to the gl-button component. See the Implementation Plan for more details.

Original Summary

Original title: Border around vulnerabilities in the Security Reports MR Widget

I'm seeing a border in the Security scanning items.

Steps to reproduce

• Visit an MR with the security scanning (e.g. !88393 (merged))
• Click Expand on the Security Report
• See the border around the vulnerabilities

Example Project

• !88393 (merged)

What is the current bug behavior?

There is a border around the link

What is the expected correct behavior?

There shouldn't be a border around the link

Relevant logs and/or screenshots

Output of checks

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Implementation plan

• frontend Replace the button element with a gl-button here: https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/app/assets/javascripts/reports/components/modal_open_name.vue

Make sure the MR Security Widget and License Compliance still works as expected.