[browser][websocket] Fix for Close Description validation (#45536)

[browser][websocket] Fix for Close Description validation (#45536)

* [browser][websocket] Fix for Close Description validation

- Issue https://github.com/dotnet/runtime/issues/45531
- The description validation exception was not being percolated through to the unit test

* Remove test code

* Address review comments.  Wrap in a try/catch that will catch that exception and store it into a task to be returned.

* Fix merge conflict

* Remove active issue

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