[BUG]: plotly is installing `js` top-level package with data files

[mgorny]

Description

plotly 6.7.0 (and git fbaf3df) are installing a js/install.json file straight into site-packages. This results in an empty js namespace being importable and confuses packages that have optional dependencies on an actual js package, i.e.:

>>> import js
>>> js
<module 'js' (namespace) from ['/usr/lib/python3.13/site-packages/js']>

Screenshots/Video

n/a

Steps to reproduce

pip install plotly
python -c 'import js; print(js)'  # should fail / not exist

Notes

n/a

[emilykl]

Thanks for flagging, @mgorny -- this is likely a result of the changes in #5540. I'll open a PR to fix.