feat(GlDuoChat): detect streaming based on chunkId

mentioned in commit 5208e418

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!312 (merged)

mentioned in merge request gitlab-org/frontend/playground/accessibility-scanner!28 (merged)

mentioned in merge request status-page!903

mentioned in merge request gitlab!148883 (merged)

mentioned in merge request gitlab!148898 (closed)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3805 (merged)