Do not allow concurrent runs of the real time benchmark

Closes GH-19345

Author: kocsismate

.github/workflows/real-time-benchmark.yml

@@ -45,6 +45,9 @@ on:
 permissions:
   contents: read
   pull-requests: write
+concurrency:
+  group: ${{ github.workflow }}
+  cancel-in-progress: false
 jobs:
   REAL_TIME_BENCHMARK:
     name: REAL_TIME_BENCHMARK