[tests] Add tests for examples (#9403)

These tests will run if one of the conditions is met:

- any change to `./examples`
- any changes to `./packages/frameworks`

The test ensures that examples can build and deploy without errors.

In a future PR, we could improve these tests to make requests to the
test deployment (like we do for probes).

examples/ionic-angular/package.json

@@ -18,6 +18,9 @@
     "url": "https://github.com/ionic-team/ionic-conference-app.git"
   },
   "private": true,
+  "engines": {
+    "node": "16.x"
+  },
   "dependencies": {
     "@angular/common": "^8.2.14",
     "@angular/core": "^8.2.14",