Add text_align to existing formatter

[hoxbro]

Fixes #5807 and fixes #5876

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (7eb9c71) 84.00% compared to head (d8eb9d0) 84.00%.
Report is 3 commits behind head on main.

Files	Patch %	Lines
panel/widgets/tables.py	96.77%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5866   +/-   ##
=======================================
  Coverage   84.00%   84.00%           
=======================================
  Files         290      290           
  Lines       42391    42425   +34     
=======================================
+ Hits        35609    35639   +30     
- Misses       6782     6786    +4     

Flag	Coverage Δ
ui-tests	40.90% <44.00%> (+<0.01%)	⬆️
unitexamples-tests	72.36% <98.00%> (-0.01%)	⬇️

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[philippjfr]

Looks good!

[hoxbro]

Need to update warn message one more place

[philippjfr]

Failures seem unrelated, but I have to say I'm quite perplexed by FAILED panel/tests/io/test_cache.py::test_per_session_cache - ValueError: Callback functions must have signature func(session_context), got func(session_context=None). How can this happen transiently?