Webclient: Handle firing an event once (#4499)

* draft: handle firing an event once

* lint

* Prevent rapid double-click on sending messages

* no rest spread on single primative when sibling components exist

* clear message instead of using a fireOnce handler.

* fix tests

* remove unnecessary validate mock

webclient/src/setupTests.ts

@@ -1,5 +1,8 @@
 import protobuf from 'protobufjs';
 
+// ensure jest-dom is always available during testing to cut down on boilerplate
+import '@testing-library/jest-dom';
+
 class MockProtobufRoot {
   load() {}
 }