feat(GlDuoChat): Change empty state

mentioned in commit 252bac42

mentioned in merge request gitlab-org/editor-extensions/gitlab-jetbrains-plugin!896 (merged)

mentioned in merge request status-page!903

mentioned in merge request gitlab-org/frontend/playground/accessibility-scanner!49 (merged)

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!343 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!4026 (merged)

mentioned in merge request gitlab!165456 (closed)

mentioned in merge request gitlab!165458 (merged)

mentioned in commit e3e4d0c7

mentioned in merge request gitlab!165726 (merged)

mentioned in merge request gitlab!166177 (merged)