feat(GlSearchBoxByType): Clear button events

mentioned in commit 404e3dd7

mentioned in merge request gitlab!102214 (merged)

mentioned in merge request status-page!630 (merged)

mentioned in merge request gitlab-docs!3225 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3109 (merged)

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!87 (merged)