fix: Add exception logging to Stream.trigger

[Azaya89]

Fixes #6894

This PR adds logging for exceptions raised in the stream subscriber system and also ensures that the remaining subscribers continue and not fail silently.

• Pull request title follows the conventional format
• Tests added and are passing

[codecov]

Codecov Report

❌ Patch coverage is 95.65217% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.29%. Comparing base (e5e0ad6) to head (e12825f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
holoviews/streams.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6902   +/-   ##
=======================================
  Coverage   89.29%   89.29%           
=======================================
  Files         344      344           
  Lines       74881    74903   +22     
=======================================
+ Hits        66863    66884   +21     
- Misses       8018     8019    +1     

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