Remove airflow user from `Dockerfile.ci` (#31970)

diff --git a/Dockerfile.ci b/Dockerfile.ci
index a8eb998..5d77caf 100644
--- a/Dockerfile.ci
+++ b/Dockerfile.ci
@@ -1268,12 +1268,7 @@
 RUN bash /scripts/docker/install_mysql.sh prod \
     && bash /scripts/docker/install_mysql.sh dev \
     && bash /scripts/docker/install_mssql.sh \
-    && bash /scripts/docker/install_postgres.sh dev \
-    && adduser --gecos "First Last,RoomNumber,WorkPhone,HomePhone" --disabled-password \
-              --quiet "airflow" --home "/home/airflow" \
-    && echo -e "airflow\nairflow" | passwd airflow 2>&1 \
-    && echo "airflow ALL=(ALL) NOPASSWD: ALL" > /etc/sudoers.d/airflow \
-    && chmod 0440 /etc/sudoers.d/airflow
+    && bash /scripts/docker/install_postgres.sh dev
 
 # Install Helm
 ARG HELM_VERSION="v3.9.4"