build(aio): move test config and e2e tests into subfolders (#21763)

This is in preparation of putting firebase and service worker
deployment tests into the project.

PR Close #21763

aio/.angular-cli.json

@@ -39,7 +39,7 @@
   ],
   "e2e": {
     "protractor": {
-      "config": "./protractor.conf.js"
+      "config": "tests/e2e/protractor.conf.js"
     }
   },
   "lint": [
@@ -50,12 +50,12 @@
       "project": "src/tsconfig.spec.json"
     },
     {
-      "project": "e2e/tsconfig.e2e.json"
+      "project": "tests/e2e/tsconfig.e2e.json"
     }
   ],
   "test": {
     "karma": {
-      "config": "./karma.conf.js"
+      "config": "src/karma.conf.js"
     }
   },
   "defaults": {