ci: Add concurrency control to Run benchmarks workflow (#4551)

Add concurrency control to GitHub Actions workflow to cancel in-progress runs

.github/workflows/codspeed.yml

@@ -13,6 +13,10 @@ on:
       - "src/backend/tests/performance/**"
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   codspeed:
     name: Run benchmarks