Support passing `plotlyjs` argument from `kaleido.*` into `PageGenerator` constructor

[emilykl]

Currently, passing plotlyjs into the Kaleido constructor results in the following error:

  File "/Users/ekl/code/plotly.py/venv/plotly.py/lib/python3.12/site-packages/choreographer/browsers/chromium.py", line 161, in __init__
    raise RuntimeError(
RuntimeError: Chromium.get_cli() received invalid args: dict_keys(['plotlyjs'])

We should handle it the same way mathjax is handled.

This is required to address plotly/plotly.py#5206.