Timeout perf test after 5 minutes; don't restart containers (#2831)

This should hopefully fix / speed up some of the recent CI issues
@ReactorScram is hitting

.github/workflows/ci.yml

@@ -192,6 +192,7 @@ jobs:
         run: ${{ matrix.execute }}
       - name: ${{ matrix.test_name }} Perfomance Test
         id: perfomance-test
+        timeout-minutes: 5
         run: |
           set -xe
 
@@ -199,7 +200,6 @@ jobs:
           # generated by UDP tests. Wire is especially chatty.
           sed -i 's/^\(\s*\)RUST_LOG:.*$/\1RUST_LOG: wire=error,info/' docker-compose.yml
           cat docker-compose.yml | grep RUST_LOG
-          docker compose down client gateway relay
           docker compose up -d client gateway relay
 
           mkdir -p /tmp/iperf3results