Add subsystems regression tests to CI (#3527)

Fixes https://github.com/paritytech/polkadot-sdk/issues/3530

.gitlab/pipeline/test.yml

@@ -494,3 +494,15 @@ test-syscalls:
       printf "The x86_64 syscalls used by the worker binaries have changed. Please review if this is expected and update polkadot/scripts/list-syscalls/*-worker-syscalls as needed.\n";
       fi
   allow_failure: false # this rarely triggers in practice
+
+subsystem-regression-tests:
+  stage: test
+  extends:
+    - .docker-env
+    - .common-refs
+    - .run-immediately
+  script:
+    - cargo test --profile=testnet -p polkadot-availability-recovery --test availability-recovery-regression-bench --features subsystem-benchmarks
+  tags:
+    - benchmark
+  allow_failure: true