fix: Disable additional context in chat query/mutation

mentioned in merge request !1989 (merged)

mentioned in merge request gitlab-org/workspaces/gitlab-workspaces-tools!3 (merged)

mentioned in merge request gitlab-org/workspaces/gitlab-workspaces-tools!12 (closed)

mentioned in merge request gitlab-org/workspaces/gitlab-workspaces-tools!26 (merged)

mentioned in merge request gitlab-org/workspaces/gitlab-workspaces-tools!28 (closed)