Allow names to be disabled for chatbox

[ahuang11]

chat_box = pn.widgets.ChatBox(
    value=[
        {"You": "Hello!"},
        {"Machine": "Hi there!"},
        {"GPT3.5": "Hey all!"},
        {"GPT4": "Greetings!"},
    ],
    message_icons={
        "You": "https://user-images.githubusercontent.com/42288570/246667322-33a2a320-9ea3-4e79-8fb8-fcb5b6eac9c0.png",
        "Machine": "https://user-images.githubusercontent.com/42288570/246671017-d3a26763-f7f5-4e8d-8933-cb69670f90a8.svg",
        "GPT3.5": "https://user-images.githubusercontent.com/42288570/246667325-ad4e3434-d173-4463-bb98-5c5d4a892b25.png",
        "GPT4": "https://user-images.githubusercontent.com/42288570/246667324-5cf26789-765f-4f76-a8bf-49309d2ae84f.png",
    },
    allow_names=False,
)

chat_box

Continues addressing #5135

[codecov]

Codecov Report

Merging #5152 (2b0eafd) into main (b53c4a5) will decrease coverage by 10.08%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main    #5152       +/-   ##
===========================================
- Coverage   83.78%   73.70%   -10.08%     
===========================================
  Files         274      274               
  Lines       39491    39498        +7     
===========================================
- Hits        33086    29112     -3974     
- Misses       6405    10386     +3981     

Flag	Coverage Δ
ui-tests	?
unitexamples-tests	73.70% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
panel/tests/widgets/test_chatbox.py	100.00% <100.00%> (ø)
panel/widgets/chatbox.py	95.61% <100.00%> (+0.01%)	⬆️

... and 60 files with indirect coverage changes

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[philippjfr]

Plotly test failures seem unrelated, I'll merge and then fix up the tests.