Load bokeh mathjax bundle when mathjax extension is loaded

[philippjfr]

Fixes #5833

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 82.98%. Comparing base (47ef103) to head (21b9d4f).
Report is 8 commits behind head on main.

Files	Patch %	Lines
panel/io/resources.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6564      +/-   ##
==========================================
+ Coverage   82.96%   82.98%   +0.02%     
==========================================
  Files         313      313              
  Lines       45997    46019      +22     
==========================================
+ Hits        38162    38190      +28     
+ Misses       7835     7829       -6     

Flag	Coverage Δ
ui-tests	40.07% <0.00%> (-0.01%)	⬇️
unitexamples-tests	71.23% <0.00%> (+0.02%)	⬆️

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