Adding concurrency section for a couple ci workflows

.github/workflows/ci-format-repo.yaml

@@ -4,6 +4,11 @@ on:
   pull_request:
     branches: [ main ]
   workflow_dispatch:
+
+concurrency:
+  group: ci-format-repo-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   format:
     name: Format PR

.github/workflows/ci-sysbench-runner-tests.yaml

@@ -7,6 +7,10 @@ on:
       - 'go/**'
       - 'integration-tests/**'
 
+concurrency:
+  group: ci-sysbench-runner-tests-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   mysql_client_integrations_job:
     runs-on: ubuntu-18.04