Fix dynamically updating description tooltips

[ahuang11]

Closes #6620 and also fixes descriptions for other widgets

import panel as pn

pn.extension()

button_icon = pn.widgets.ButtonIcon(
    active_icon="check",
    description="Hey",
    icon="clipboard",
    size="5em",
    toggle_duration=1000,
)

button = pn.widgets.Button(
    name="Testing",
    description="Hey"
)

checkbox_group = pn.widgets.RadioButtonGroup(
    options=["Biology", "Chemistry", "Physics"],
    description="Hey"
)

pn.Column(
    button_icon,
    button_icon.param.description,
    button,
    button.param.description,
    checkbox_group,
    checkbox_group.param.description
).servable()

Screen.Recording.2024-04-04.at.3.18.15.PM.mov

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.83%. Comparing base (2996220) to head (602ebb9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6676   +/-   ##
=======================================
  Coverage   82.82%   82.83%           
=======================================
  Files         313      313           
  Lines       46151    46160    +9     
=======================================
+ Hits        38226    38235    +9     
  Misses       7925     7925           

Flag	Coverage Δ
ui-tests	39.98% <100.00%> (+0.01%)	⬆️
unitexamples-tests	71.10% <0.00%> (-0.02%)	⬇️

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[MarcSkovMadsen]

Looks good to me. Thanks.