Dynamically set the NPM tag

[fcollonval]

The current publishing action does not deal with setting the NPM tag although we look if the release is a prerelease or not.

This sets the npm tag depending on whether the release is a prerelease or not. It adds also a new npm_tag option to override the tag.

This was tested successfully on https://github.com/jupyterlab/jupyterlab-git/actions/runs/5312255052/jobs/9616511151

[fcollonval]

I'm not seeing why the test jupyter_releaser/tests/test_cli.py::test_publish_assets_npm is failing. I guess this is due to the new arguments. But I'm missing what is wrong.

[fcollonval]

@blink1073 I'm unsure what to do about the linter error (it is not a modified line):

jupyter_releaser/lib.py:352:13: B028 No explicit `stacklevel` keyword argument found

Do you have any advice?

[blink1073]

Do you have any advice?

See my commit. :)

[blink1073]

Thank you!