PDFx test for sample-scientific.pdf

Input: sample-scientific.pdf

(cd "sample-scientific.pdf_dir" && uv run --project "$repo_root" pdfx -t "sample-scientific.pdf_name" -o "sample-scientific--pdfx-python.txt")

(cd "sample-scientific.pdf_dir" && uv run --project "$repo_root" pdfx -j "sample-scientific.pdf_name" -o "sample-scientific--pdfx-python.json")