Intent of mcpGatewayToolBrokerChannel.test|title=McpGatewayToolBrokerChannel invalidates stale grace entry when cacheState regresses to Unknown after timeout|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
    
    mcp/ 1 test
    
    test/ 1 test
    
    common/ 1 test
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/workbench/contrib/mcp/test/common/mcpGatewayToolBrokerChannel.test|title=McpGatewayToolBrokerChannel invalidates stale grace entry when cacheState regresses to Unknown after timeout|occurrence=1 Introduced here