Animate the bulk actions section

What does this MR do?

This leverages GlCollapse to expand/collapse the bulk actions in vulnerability lists.

Note that it uses Bootstrap's default collapse transition settings, which has a duration of .35s.

Screenshots (strongly suggested)

General vulnerability list

Before	After
list_before	list_after

Pipelines vulnerability list

Before	After
pipelines_before	pipeline_after

Does this MR meet the acceptance criteria?

Conformity

• 📋 Does this MR need a changelog?
  • I have included a changelog entry.
  • [-] I have not included a changelog entry because _____.

Related to #322324 (closed)