Improvements for pyodide wheels and caching

[philippjfr]

• Include bokeh/core/_templates in pyodide wheel
• Use custom wheels in docs and in convert
• Fixes for service worker cache invalidation and setup

[codecov]

Codecov Report

Merging #3863 (5af7925) into master (10aaead) will increase coverage by 7.73%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3863      +/-   ##
==========================================
+ Coverage   75.17%   82.90%   +7.73%     
==========================================
  Files         224      224              
  Lines       32763    32785      +22     
==========================================
+ Hits        24629    27180    +2551     
+ Misses       8134     5605    -2529     

Flag	Coverage Δ
ui-tests	34.37% <0.00%> (?)
unitexamples-tests	75.14% <0.00%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
panel/io/convert.py	30.98% <0.00%> (-0.13%)	⬇️
panel/io/state.py	69.54% <0.00%> (+0.19%)	⬆️
panel/util.py	86.71% <0.00%> (+0.36%)	⬆️
panel/pane/base.py	87.91% <0.00%> (+0.41%)	⬆️
panel/widgets/slider.py	95.14% <0.00%> (+0.74%)	⬆️
panel/reactive.py	78.18% <0.00%> (+0.76%)	⬆️
panel/widgets/tables.py	88.31% <0.00%> (+0.99%)	⬆️
panel/tests/pane/test_vtk.py	100.00% <0.00%> (+1.48%)	⬆️
panel/tests/pane/test_vega.py	100.00% <0.00%> (+2.38%)	⬆️
panel/io/callbacks.py	78.94% <0.00%> (+3.75%)	⬆️
... and 15 more

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