Intent of turnStarted model selection waits for model selection before sending the message|occurrence=1

All 2 exact tests in this concept. Every test is marked by where it enters the hierarchy.

mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/ 2 tests
- platform/ 2 tests
  - agentHost/ 2 tests
    
    test/ 2 tests
    
    node/ 2 tests
    
    agentSideEffects.test|title=AgentSideEffects handleAction — chat/ 2 tests
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/platform/agentHost/test/node/agentSideEffects.test|title=AgentSideEffects handleAction — chat/turnStarted model selection calls changeModel on the agent before sending the message|occurrence=1 Inherited turnStarted model selection calls changeModel on the agent before sending the message|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/platform/agentHost/test/node/agentSideEffects.test|title=AgentSideEffects handleAction — chat/turnStarted model selection waits for model selection before sending the message|occurrence=1 Introduced here