Intent of ipc.ts ×3

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
- base/ 2 tests
  - parts/ 2 tests
    
    ipc/ 2 tests
    
    test/ 2 tests
    
    common/ 2 tests
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/base/parts/ipc/test/common/ipc.test|title=Base IPC one to many server gets pings from all clients (broadcast channel)|occurrence=1 Inherited ipc.ts ×8
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/base/parts/ipc/test/common/ipc.test|title=Base IPC one to one request rejects (and cleans up) when serialization throws on the deferred path|occurrence=1 Inherited ipc.ts ×2