Run the OpenVINO harness when setup-openvino.sh or test_backend.sh changes

The OpenVINO harness ran on a pull request only when
test-backend-openvino.yml or _test_backend.yml changed. A change to
setup-openvino.sh, such as the next OpenVINO version bump, or any change to
test_backend.sh, which calls it, got no harness run before merge unless
someone added the ciflow/nightly label. Add both scripts to the pull_request
paths, so such pull requests show the harness build and test results.

Author: shoumikhin

.github/workflows/test-backend-openvino.yml

@@ -10,6 +10,8 @@ on:
       - ciflow/nightly/*
   pull_request:
     paths:
+      - .ci/scripts/setup-openvino.sh
+      - .ci/scripts/test_backend.sh
       - .github/workflows/test-backend-openvino.yml
       - .github/workflows/_test_backend.yml
   workflow_dispatch: