Intent of chatPerf.test|title=chatPerf markChat emits a mark with the expected prefix|occurrence=1, chatPerf.test|title=chatPerf clearChatMarks removes all marks for the session|occurrence=1, +1

All 3 exact tests in this concept. Every test is marked by where it enters the hierarchy.

mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/ 3 tests
- workbench/ 3 tests
  - contrib/ 3 tests
    
    chat/ 3 tests
    
    test/ 3 tests
    
    common/ 3 tests
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/workbench/contrib/chat/test/common/chatPerf.test|title=chatPerf clearChatMarks does not affect marks from a different session|occurrence=1 Introduced here
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/workbench/contrib/chat/test/common/chatPerf.test|title=chatPerf clearChatMarks removes all marks for the session|occurrence=1 Introduced here
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/workbench/contrib/chat/test/common/chatPerf.test|title=chatPerf markChat emits a mark with the expected prefix|occurrence=1 Introduced here