[Internal] Fix processing of quoted titles (#989)

## Changes
Fix processing of `quoted` titles. 

Follows GitHub recommendations

https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#good-practices-for-mitigating-script-injection-attacks

## Tests
This PR

.github/workflows/message.yml

@@ -20,8 +20,10 @@ jobs:
           fetch-depth: 0
 
       - name: Validate Tag
+        env:
+          TITLE: ${{ github.event.pull_request.title }}
         run: |
-          TAG=$(echo ${{ github.event.pull_request.title }} | sed -ne 's/\[\(.*\)\].*/\1/p')
+          TAG=$(echo "$TITLE" | sed -ne 's/\[\(.*\)\].*/\1/p')
           if grep -q "tag: \"\[$TAG\]\"" .codegen/changelog_config.yml; then 
             echo "Valid tag found: [$TAG]"
           else