Ensure Reactive objects are re-rendered correctly

[philippjfr]

Ensure that we only implement custom object handling for PaneBase types.

[codecov]

Codecov Report

Merging #4868 (0d10cc8) into main (753cc20) will increase coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #4868      +/-   ##
==========================================
+ Coverage   83.21%   83.35%   +0.13%     
==========================================
  Files         270      270              
  Lines       38120    38122       +2     
==========================================
+ Hits        31721    31776      +55     
+ Misses       6399     6346      -53     

Flag	Coverage Δ
ui-tests	40.82% <0.00%> (+1.02%)	⬆️
unitexamples-tests	73.34% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
panel/pane/base.py	83.65% <100.00%> (-0.19%)	⬇️

... and 10 files with indirect coverage changes

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