Fix compatibility with older versions of Docker Compose (#7170)

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### Motivation and context
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In 6ae1cff, I accidentally left behind the empty `command:` key. This
works, but only with Docker Compose v2.17.1+. Since we don't actually
need this key, we might as well remove it and restore compatibility with
older versions.

Also, rearrange the commented out code so that you only need to
uncomment one block to enable the Traefik dashboard.

Fixes #7153.

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Manual testing.

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changelog.d/20231123_141337_roman_fix_docker_compose_compat.md

@@ -0,0 +1,4 @@
+### Fixed
+
+- Restored Compose file compatibility with Docker Compose 2.17.0 and earlier
+  (<https://github.com/opencv/cvat/pull/7170>)

docker-compose.yml

@@ -223,12 +223,6 @@ services:
     image: traefik:v2.10
     container_name: traefik
     restart: always
-    command:
-    # labels:
-    #   - traefik.enable=true
-    #   - traefik.http.routers.dashboard.entrypoints=dashboard
-    #   - traefik.http.routers.dashboard.service=api@internal
-    #   - traefik.http.routers.dashboard.rule=Host(`${CVAT_HOST:-localhost}`)
     ports:
       - 8080:8080
       - 8090:8090
@@ -248,10 +242,14 @@ services:
       TRAEFIK_PROVIDERS_DOCKER_EXPOSEDBYDEFAULT: "false"
       TRAEFIK_PROVIDERS_DOCKER_NETWORK: cvat
       TRAEFIK_PROVIDERS_FILE_DIRECTORY: /etc/traefik/rules
-
-      # Uncomment to get Traefik dashboard
-      # TRAEFIK_API_DASHBOARD: "true"
-      # TRAEFIK_ENTRYPOINTS_dashboard_ADDRESS: :8090
+    # Uncomment to get Traefik dashboard
+    #   TRAEFIK_API_DASHBOARD: "true"
+    #   TRAEFIK_ENTRYPOINTS_dashboard_ADDRESS: :8090
+    # labels:
+    #   - traefik.enable=true
+    #   - traefik.http.routers.dashboard.entrypoints=dashboard
+    #   - traefik.http.routers.dashboard.service=api@internal
+    #   - traefik.http.routers.dashboard.rule=Host(`${CVAT_HOST:-localhost}`)
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock:ro
       - ./components/analytics/grafana_conf.yml:/etc/traefik/rules/grafana_conf.yml:ro