Run OpenDuT integration tests

There are some tests that depend on third-party software. These tests require the test environment to be running and reachable from the machine where the tests are executed.

• Start the test environment:

  cargo theo vagrant ssh
  cargo theo testenv start --skip-telemetry
  

• Run the tests that depend on the test environment:

  export OPENDUT_RUN_KEYCLOAK_INTEGRATION_TESTS=true
  export OPENDUT_RUN_NETBIRD_INTEGRATION_TESTS=true
  cargo ci check
  
  # or explicitly run specific tests only
  cargo test --package opendut-auth-tests client::test_confidential_client_get_token --all-features --
  cargo test --package opendut-auth-tests --all-features -- --nocapture
  cargo test --package opendut-vpn-netbird client::integration_tests --all-features -- --nocapture