modify trigger to match against ONLY package or testproject changes

Author: michalChrobot

.yamato/_triggers.yml

@@ -77,9 +77,13 @@ pull_request_trigger:
     - .yamato/desktop-standalone-tests.yml#desktop_standalone_test_testproject_win_il2cpp_6000.0
     - .yamato/cmb-service-standalone-tests.yml#cmb_service_standalone_test_testproject_ubuntu_il2cpp_trunk
   triggers:
+    # Note that PR tests will run ONLY if we are changing package/sample code. If changes are let's say docs only no tests will be triggered
+    # TODO: consider setting up and running tests from Examples/
+    # TODO: or docs only changes are spelling/link check
     expression: |-
       pull_request.comment eq "ngo" AND
-      NOT pull_request.changes.all match "**/Documentation~/**"
+      (pull_request.changes.any match "com.unity.netcode.gameobjects/**" OR
+      pull_request.changes.any match "testproject/**")
     cancel_old_ci: true
 
 # Run all tests on trunk on nightly basis.