Make `availability-recovery-regression-bench` a benchmark (#3741)

Closes: https://github.com/paritytech/polkadot-sdk/issues/3704

.gitlab/pipeline/test.yml

@@ -502,7 +502,7 @@ subsystem-regression-tests:
     - .common-refs
     - .run-immediately
   script:
-    - cargo test --profile=testnet -p polkadot-availability-recovery --test availability-recovery-regression-bench --features subsystem-benchmarks
+    - cargo bench --profile=testnet -p polkadot-availability-recovery --bench availability-recovery-regression-bench --features subsystem-benchmarks
   tags:
     - benchmark
   allow_failure: true

polkadot/node/network/availability-recovery/Cargo.toml

@@ -43,9 +43,9 @@ polkadot-node-subsystem-test-helpers = { path = "../../subsystem-test-helpers" }
 polkadot-primitives-test-helpers = { path = "../../../primitives/test-helpers" }
 polkadot-subsystem-bench = { path = "../../subsystem-bench" }
 
-[[test]]
+[[bench]]
 name = "availability-recovery-regression-bench"
-path = "tests/availability-recovery-regression-bench.rs"
+path = "benches/availability-recovery-regression-bench.rs"
 harness = false
 required-features = ["subsystem-benchmarks"]