Spurious test failures in ChatListRenderer.fireItemHeightChange

[aeschli]

https://github.com/microsoft/vscode/actions/runs/30125958708/job/89589396846?pr=327391
(#327391)
https://github.com/microsoft/vscode/actions/runs/30128189422/job/89597727903?pr=327248

1) ChatListRenderer
       fireItemHeightChange defers a mid-render measurement and delivers it after the render pass:

      
      + expected - actual

       {
         "events": [
      -    86
      +    114
         ]
      -  "stored": 86
      +  "stored": 114
       }
      
  AssertionError [ERR_ASSERTION]: Expected values to be strictly deep-equal:
  + actual - expected
  
    {
      events: [
  +     86
  -     114
      ],
  +   stored: 86
  -   stored: 114
    }
  
      at Context.<anonymous> (file:///Users/runner/work/vscode/vscode/out/vs/workbench/contrib/chat/test/browser/widget/chatListRenderer.test.js:564:12)

[aeschli]

Justin Chen (@justschen) I skipped the test with #327406