[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/dojo/package.json

@@ -10,6 +10,9 @@
     "test:functional": "dojo build --mode functional && dojo test --functional --config local",
     "test:all": "dojo build --mode unit && dojo build --mode functional && dojo test --all --config local"
   },
+  "engines": {
+    "node": "16.x"
+  },
   "dependencies": {
     "@dojo/framework": "^6.0.0",
     "@dojo/themes": "^6.0.0",