fix(GlTooltip): use feedback.strong.text.color for tooltip scoped label

mentioned in commit c14a0c78

mentioned in merge request gitlab-org/frontend/playground/accessibility-scanner!67 (closed)

mentioned in merge request gitlab-svgs!1128 (merged)

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!367 (merged)

mentioned in merge request gitlab-svgs!1130 (closed)

mentioned in merge request gitlab-org/editor-extensions/gitlab-jetbrains-plugin!1644 (merged)

mentioned in merge request gitlab!186887 (merged)

mentioned in merge request gitlab!186921 (merged)

mentioned in merge request gitlab-svgs!1131 (merged)

mentioned in merge request status-page!903

mentioned in merge request gitlab!187029 (closed)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!4369 (merged)

mentioned in merge request gitlab-org/editor-extensions/gitlab-jetbrains-plugin!1652 (merged)

mentioned in merge request gitlab-org/technical-writing/docs-gitlab-com!682 (closed)

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