Prevent crashes when creating new workspaces with a YAML config

[dalyIsaac]

This PR fixes a critical crash which would occur when creating a workspace during runtime (after startup).

The issue was that a TreeLayoutPlugin event was not enqueued onto the WinUI dispatcher.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.56%. Comparing base (bd17c2c) to head (3138c6d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1068   +/-   ##
=======================================
  Coverage   80.56%   80.56%           
=======================================
  Files         283      283           
  Lines       12409    12412    +3     
  Branches     1432     1432           
=======================================
+ Hits         9997    10000    +3     
  Misses       2227     2227           
  Partials      185      185           

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