Merge branch 'refactor-split-button-spec' into 'master'

Update spec to include split button click

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/139531



Merged-by: David Pisek <dpisek@gitlab.com>
Approved-by: David Pisek <dpisek@gitlab.com>
Reviewed-by: David Pisek <dpisek@gitlab.com>
Co-authored-by: Samantha Ming <sming@gitlab.com>