fix: fix dynamic height of duo chat textarea

mentioned in commit 9ad766b6

mentioned in merge request gitlab-org/editor-extensions/gitlab-jetbrains-plugin!1212 (closed)

mentioned in merge request status-page!903

mentioned in merge request gitlab!171241 (merged)

mentioned in merge request gitlab!171266 (closed)

mentioned in merge request gitlab!171320 (merged)

mentioned in merge request gitlab-org/frontend/playground/accessibility-scanner!55 (closed)

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!352 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!4159 (merged)

mentioned in merge request gitlab-org/editor-extensions/gitlab-jetbrains-plugin!1249 (closed)

mentioned in merge request gitlab-org/frontend/playground/accessibility-scanner!58 (merged)