fix(FilteredSearchTerm): Fix view-only logic and remove unused deprecated class

mentioned in commit e2b7bbf3

mentioned in merge request gitlab-org/frontend/playground/accessibility-scanner!70 (merged)

mentioned in merge request gitlab-svgs!1156 (merged)

mentioned in merge request status-page!903

mentioned in merge request gitlab!190119 (merged)

mentioned in merge request gitlab-svgs!1157 (closed)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!4407 (merged)

mentioned in merge request gitlab-org/technical-writing/docs-gitlab-com!683 (merged)

mentioned in merge request gitlab-svgs!1164 (merged)

mentioned in merge request gitlab!191093 (merged)

mentioned in merge request gitlab-svgs!1167 (closed)

mentioned in merge request gitlab!191470 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!4433 (merged)

mentioned in merge request gitlab-org/editor-extensions/gitlab-jetbrains-plugin!1731 (merged)