.github/workflows - new workflow (elastic#12631)

Add new temporary workflow to prevent changes to specific
integration files from being changed.

.github/workflows/block-paths.yml

@@ -0,0 +1,37 @@
+name: Block Changes
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  check-blocked-paths:
+    name: Check for blocked path changes
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Check for blocked path changes
+        run: |
+          BLOCKED_PATHS=(
+            "packages/akamai/data_stream/siem/_dev/test/pipeline/"
+            "packages/cisco_ise/data_stream/log/_dev/test/pipeline/"
+          )
+
+          CHANGED_FILES=$(git diff --name-only ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }})
+
+          # Check if any blocked path is in the changed files.
+          for blocked_path in "${BLOCKED_PATHS[@]}"; do
+            if echo "$CHANGED_FILES" | grep -q "^$blocked_path"; then
+              msg="❌ ERROR: Changes to files in '$blocked_path' are currently not allowed! See @norrietaylor for details."
+              echo "$msg"
+              echo "$msg" >> $GITHUB_STEP_SUMMARY
+              exit 1
+            fi
+          done
+
+          echo "✅ No blocked paths were modified."
+          echo "✅ No blocked paths were modified." >> $GITHUB_STEP_SUMMARY