Test flake: continuation turns are not rendered in conversation history

[deepak1556]

Refs https://dev.azure.com/monacotools/Monaco/_build/results?buildId=435931&view=logs&j=61096ea8-10fd-584b-0f03-7b170d825b33&t=caf4ee27-64fa-53eb-1ad4-be22316aedc1&s=0237fa6e-9275-5b98-04d5-29ae92fc4838

 FAIL  src/extension/prompts/node/agent/test/summarization.spec.tsx > Agent Summarization > continuation turns are not rendered in conversation history
Error: Test timed out in 5000ms.
If this is a long-running test, pass a timeout value as the last argument or configure it globally with "testTimeout".
 ❯ src/extension/prompts/node/agent/test/summarization.spec.tsx:151:2
    149|  };
    150| 
    151|  test('continuation turns are not rendered in conversation history', a…
       |  ^
    152|   const firstTurn = new Turn('id1', { type: 'user', message: 'previous…
    153|   const continuationTurn = new Turn('id2', { type: 'user', message: 'c…