[nodejs] update csv table header for toolformer_rag mode, add website commit in debug info

[chejennifer]

• update csv table headers for mode=toolformer_rag:

  • line chart: "label" -> "date" e.g., https://paste.googleplex.com/4545373437952000
  • bar chart: "label" -> "variable" e.g., https://paste.googleplex.com/6171709243916288
  • map_chart: "label" -> "place"

• read website commit from environment and return it as part of debug_info

[chejennifer]

thanks for the reviews!