Intent of runSubagentTool.test|title=RunSubagentTool model fallback behavior skips Copilot fallback models when main model is BYOK and inherits the main model|occurrence=1

All 1 exact test in this concept. Every test is marked by where it enters the hierarchy.

mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/ 1 test
- workbench/ 1 test
  - contrib/ 1 test
    
    chat/ 1 test
    
    test/ 1 test
    
    common/ 1 test
    
    tools/ 1 test
    
    builtinTools/ 1 test
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/workbench/contrib/chat/test/common/tools/builtinTools/runSubagentTool.test|title=RunSubagentTool model fallback behavior skips Copilot fallback models when main model is BYOK and inherits the main model|occurrence=1 Introduced here