task(event cache): log whenever we receive an ignore user list change

[bnjbvr]

Another interesting thing to log IMO, since it clears all the rooms' event caches.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.10%. Comparing base (c61f707) to head (af8bd9a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4322      +/-   ##
==========================================
+ Coverage   85.07%   85.10%   +0.03%     
==========================================
  Files         275      275              
  Lines       30314    30315       +1     
==========================================
+ Hits        25789    25799      +10     
+ Misses       4525     4516       -9     

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