add workflow step to upload layer.zip to latest sdk release note

Author: yiyuan-he

.github/workflows/release-lambda.yml

@@ -212,3 +212,10 @@ jobs:
              layer_arns.tf layer.zip
           echo Removing release_notes.md ...
           rm -f release_notes.md
+      - name: Upload layer.zip to SDK Release Notes (tagged with latest)
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          LATEST_SDK_VERSION=$(gh release list --repo "aws-observability/aws-otel-python-instrumentation" --json tagName,isLatest -q 'map(select(.isLatest==true)) | .[0].tagName')
+          gh release upload "$LATEST_SDK_VERSION" layer.zip --repo "aws-observability/aws-otel-python-instrumentation" --clobber
+          echo "✅ layer.zip successfully uploaded to $LATEST_SDK_VERSION in the upstream repo!"