This allows to provide an item prop with a `to:` key instead of href to
create a Vue router link.

feat(GlDisclosureDropdownItem): Support Vue router links

See merge request !4008



Merged-by: Paul Gascou-Vaillancourt <pgascouvaillancourt@gitlab.com>
Approved-by: Paul Gascou-Vaillancourt <pgascouvaillancourt@gitlab.com>
Approved-by: Austin Regnery <aregnery@gitlab.com>
Reviewed-by: Paul Gascou-Vaillancourt <pgascouvaillancourt@gitlab.com>
Co-authored-by: GitLab Bot <gitlab-bot@gitlab.com>
Co-authored-by: Thomas Hutterer <thutterer@gitlab.com>

# [77.6.0](v77.5.0...v77.6.0) (2024-03-01)

### Features

* **GlDisclosureDropdownItem:** Support Vue router links ([2bff76de](2bff76de))