Raise on ChatReactionIcons instance in ChatFeed.message_params

[ahuang11]

import panel as pn

pn.extension()

chat_feed = pn.chat.ChatFeed(reaction_icons=pn.chat.ChatReactionIcons(options={"like": "thumb-up", "dislike": "thumb-down"}))
msg1 = chat_feed.send("Hello")
msg2 = chat_feed.send("Hey")

msg1.reactions = ["like"]

chat_feed

No longer linked

[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 40.25%. Comparing base (b3fcdad) to head (6330c59).
Report is 9 commits behind head on main.

Files	Patch %	Lines
panel/tests/chat/test_feed.py	50.00%	2 Missing ⚠️
panel/chat/feed.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #6814       +/-   ##
===========================================
- Coverage   81.54%   40.25%   -41.29%     
===========================================
  Files         314      314               
  Lines       46453    46560      +107     
===========================================
- Hits        37879    18744    -19135     
- Misses       8574    27816    +19242     

Flag	Coverage Δ
ui-tests	40.25% <72.72%> (+2.78%)	⬆️
unitexamples-tests	?

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