fix: Add disconnected_by to EventWebhook

[SMadani]

Adds the disconnected_by field to EventWebhook, as per the webhook reference.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.19%. Comparing base (1f9c8b3) to head (3456267).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #565   +/-   ##
=========================================
  Coverage     98.19%   98.19%           
- Complexity     3939     3944    +5     
=========================================
  Files           564      565    +1     
  Lines          8738     8748   +10     
  Branches        499      499           
=========================================
+ Hits           8580     8590   +10     
  Misses          136      136           
  Partials         22       22           

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