BREAKING CHANGE: Remove GlDropdown export (!1613) · Merge requests · GitLab.org / gitlab-ui

Mike Greiling requested to merge mg-remove-gl-dropdown into master Jul 30, 2020

What does this MR do?

Removes the deprecated GlDropdown export as part of #673 (closed) and &1059

Code review guidelines.
GitLab UI's contributing guidlines.
If it changes a Pajamas-compliant component's look & feel, the MR has been reviewed by a UX designer.
If it changes GitLab UI's documentation guidelines, the MR has been reviewed by a Technical Writer.
If the MR changes a component's API, integration MR(s) have been opened in the following projects to ensure that the @gitlab/ui package can be upgraded quickly after the changes are released:
- GitLab: mr_url
- Customers Portal: mr_url
- Status Page: mr_url
Added the ~"component:*" label(s) if applicable.