Prevent TextAreaInput from auto sending messages in ChatInterface unless specified

[ahuang11]

I don't think TextAreaInput should auto send by default because users need to usually gather info from other browser tabs.

At the moment, if the user copies text from another browser tab, it sends the existing, unfinished message which can be irritating.

The prior logic uses isinstance() which makes TextAreaInput always auto send since TextAreaInput is a subclass of TextInput

A workaround is to have auto_send_types set to some arbitrary value.

[codecov]

Codecov Report

Merging #5762 (db0c85a) into main (0aa4b18) will decrease coverage by 8.80%.
Report is 13 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #5762      +/-   ##
==========================================
- Coverage   82.47%   73.68%   -8.80%     
==========================================
  Files         288      289       +1     
  Lines       42072    42122      +50     
==========================================
- Hits        34700    31038    -3662     
- Misses       7372    11084    +3712     

Flag	Coverage Δ
ui-tests	?
unitexamples-tests	73.68% <100.00%> (-0.07%)	⬇️

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Files	Coverage Δ
panel/chat/interface.py	95.48% <100.00%> (ø)
panel/tests/chat/test_interface.py	100.00% <100.00%> (ø)

... and 72 files with indirect coverage changes

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