Add concurrency settings and update linter configurations for policy integration tests

Author: taoyangcloud

.github/linters/.checkov.yml .github/linters/.checkov.yaml.github/linters/.checkov.yml renamed to .github/linters/.checkov.yaml

@@ -1,3 +1,4 @@
+severity: medium
 rules:
   unpinned-uses:
     disable: true

.github/linters/.zizmor.yml

@@ -23,6 +23,10 @@ on:
         type: boolean
         default: false
 
+concurrency:
+  group: ${{ github.workflow }}
+  cancel-in-progress: false
+
 permissions:
   contents: read