Ensure FloatPanel correctly exposes its children

[philippjfr]

Fixes #5373

[codecov]

Codecov Report

Merging #5433 (fefc7b7) into main (970399a) will decrease coverage by 2.50%.
Report is 1 commits behind head on main.
The diff coverage is 20.00%.

@@            Coverage Diff             @@
##             main    #5433      +/-   ##
==========================================
- Coverage   83.30%   80.80%   -2.50%     
==========================================
  Files         274      274              
  Lines       40005    40010       +5     
==========================================
- Hits        33325    32331     -994     
- Misses       6680     7679     +999     

Flag	Coverage Δ
ui-tests	40.71% <20.00%> (-0.01%)	⬇️
unitexamples-tests	70.09% <20.00%> (-2.53%)	⬇️

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Files Changed	Coverage Δ
panel/layout/float.py	85.71% <20.00%> (-8.89%)	⬇️

... and 19 files with indirect coverage changes

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