Remove deprecations

[hoxbro]

Continue work from #5776

Resolves #5327
Resolves #5517

I already needed to remove some of py2js in examples here: 1579783 in #5895

[codecov-commenter]

Codecov Report

Merging #5915 (f7817af) into main (912d520) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #5915      +/-   ##
==========================================
+ Coverage   88.58%   88.67%   +0.09%     
==========================================
  Files         313      313              
  Lines       65066    64941     -125     
==========================================
- Hits        57636    57588      -48     
+ Misses       7430     7353      -77     

Flag	Coverage Δ
ui-tests	23.26% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
holoviews/core/boundingregion.py	65.46% <ø> (+3.04%)	⬆️
holoviews/operation/datashader.py	84.04% <ø> (+0.18%)	⬆️
holoviews/plotting/bokeh/element.py	88.37% <ø> (+0.23%)	⬆️
holoviews/plotting/bokeh/util.py	68.90% <100.00%> (+2.09%)	⬆️
holoviews/tests/plotting/bokeh/test_elementplot.py	99.50% <100.00%> (+2.58%)	⬆️
holoviews/tests/plotting/test_plotutils.py	99.41% <ø> (+2.22%)	⬆️

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[philippjfr]

All looks good.

[github-actions]

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