Add validate PR description workflow (#689)

* Add validate PR description workflow

* Fix PR validation workflow name

.github/workflows/hip-validate-pr-description.yml

@@ -0,0 +1,27 @@
+name: Validate HIP PR description
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize]
+    paths:
+      - "projects/hip/**"
+      - "projects/clr/**"
+      - "projects/hipother/**"
+      - "projects/hip-tests/**"
+
+jobs:
+  validate-pr-description:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - name: Validate PR description
+        env:
+          PR_DESCRIPTION: ${{ github.event.pull_request.body }}
+        run: python .github/scripts/hip_validate_pr_description.py