Run tests for all web app packages in CI (#22579)

* Run tests for all web app packages in CI

* Test specific packages instead of all of them

* Revert back to using test-ci scripts and rely on Jest to count the number of CPU cores

* Revert more changes made to the web app CI tests

* Fix path to client package tests

webapp/platform/client/package.json

@@ -39,6 +39,7 @@
     "build": "tsc --build --verbose",
     "run": "tsc --watch --preserveWatchOutput",
     "test": "jest",
+    "test-ci": "jest --ci --forceExit --detectOpenHandles --maxWorkers=100%",
     "clean": "rm -rf lib node_modules tsconfig.tsbuildinfo"
   }
 }