[browser][websocket] Throw OperationCanceledException on connect (#44722)

[browser][websocket] Throw OperationCanceledException on connect (#44722)

* [browser][websocket] Throw OperationCanceledException on connect if cancel was requested before.

* try to handle cancellation in connect stage

* Add new test for inflight connect

- Add new supported property for skipping particular tests when Browser is detected and DOM is detected.

* first pass at throwing pnse when websocket is missing

* Address review comment

* Make the platform check explicit

* Revert CreateDefaultOptions change

* Address review comment

Co-authored-by: Larry Ewing <lewing@microsoft.com>