chore(security-guardian): security-guardian to skip release pr (#34386)

### Issue # (if applicable)

Closes #<issue number here>.
None

### Reason for this change
security-guardian runs and fails for chore(release) pr like [PR-34383](#34383). the PRs which are a part of this release would have already gone through the checks. 



### Description of changes
checks if the PR title has `chore(release)` and skips execution


### Describe any new or updated permissions being added




### Description of how you validated changes



### Checklist
- [ x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: QuantumNeuralCoder

.github/workflows/security-guardian.yml

@@ -5,7 +5,15 @@ on:
 jobs:
   run-security-guardian:
     runs-on: ubuntu-latest
-    steps:
+    steps:      
+      - name: Skip check for release PRs
+        if: |
+            (
+              startsWith(github.event.pull_request.title, 'chore(release):') ||
+              startsWith(github.event.pull_request.title, 'chore(merge-back):')
+            )
+        run: echo "Skipping Security Guardian for release PR" && exit 0
+
       - name: Checkout
         uses: actions/checkout@v4
         with: