build: Small updates to build infrastructure

[hoxbro]

• Apply changes to exclude node_modules. See compat: Hatchling 1.26 panel#7526. It does not seem to have affected GeoViews 1.13.1rc0. But it cannot hurt!
• Moving the conda-build step to use sdist instead of the wheel as was done in: Overriding parameter value with None in subclass ignored param#97, and what is done on conda-forge
• Add the newly introduced --package-format to the conda-build command to ensure that the correct package format is always used. No change to the format itself! See https://github.com/conda/conda-build/releases/tag/24.11.0
• Remove the warning emitted from the publish step in:
  
• Run npm audit fix
• Use $PACKAGE._version.__version__ to be sure the _version.py file has been created.
• Use bokeh/label/rc for the conda build workflow.

The difference in build between this PR and the GeoViews 1.13.1rc0 is:

Geoviews - wheel has identical filelist
Geoviews - sdist has identical filelist
                           Geoviews - conda #1
┏━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Files only in run 1     ┃ Files only in run 2                         ┃
┃ geoviews core 1.13.1rc0 ┃ geoviews core 1.13.1rc0.post1.dev4+g735ab14 ┃
┡━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
│ -                       │ site-packages/geoviews/.bokeh               │
└─────────────────────────┴─────────────────────────────────────────────┘
Geoviews - npmjs has identical filelist