feat(GlAccordion): add chevron animation

See merge request gitlab-org/gitlab-ui!4832



Merged-by: Paul Slaughter <pslaughter@gitlab.com>
Approved-by: Jeremy Elder <jelder@gitlab.com>
Approved-by: Kushal Pandya <kushal@gitlab.com>
Approved-by: Paul Slaughter <pslaughter@gitlab.com>
Co-authored-by: GitLab Bot <gitlab-bot@gitlab.com>
Co-authored-by: Julia Miocene <jmiocene@gitlab.com>

# [103.5.0](gitlab-org/gitlab-ui@v103.4.1...v103.5.0) (2024-11-22)

### Features

* **GlAccordion:** add chevron animation ([fee4ef4d](gitlab-org/gitlab-ui@fee4ef4d))