Organize S3 schema uploads by product (awx/tower) (#16190)

Update schema upload workflows to organize S3 files by product name:
- Upload schemas to s3://awx-public-ci-files/{product}/{branch}/schema.json
- Update Makefile to download from product-specific paths for schema diff
- Update feature branch deletion to clean up from correct product path

This separates AWX and Tower schemas into distinct S3 folders.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <noreply@anthropic.com>

.github/workflows/upload_schema.yml

@@ -42,7 +42,7 @@ jobs:
         with:
           command: cp
           source: ${{ github.workspace }}/schema.json
-          destination: s3://awx-public-ci-files/${{ github.ref_name }}/schema.json
+          destination: s3://awx-public-ci-files/${{ github.event.repository.name }}/${{ github.ref_name }}/schema.json
           aws_access_key_id: ${{ secrets.AWS_ACCESS_KEY }}
           aws_secret_access_key: ${{ secrets.AWS_SECRET_KEY }}
           aws_region: us-east-1