Run qnx unit tests using score_qnx_unit_tests for x86 and arch64 toolchain

### What

Run qnx unit tests using score_qnx_unit_tests for x86 and arch64 toolchain

Currently all unit tests in this repo are executed on a x86 host. However qnx_only targets cannot be executed on such a host and require the unit test bins to be run in a qnx based qemu both on x86 and arm64 arch.

NOTE: py_unittest_qnx_test is a no-op
https://github.com/eclipse-score/logging/blob/104ee1aca2ccbfe503b617a308387f18b2632f19/third_party/itf/py_unittest_qnx_test.bzl#L23

### Acceptance Criteria (DoD)

CI job running all unit tests with --config=arm64-qnx and --config=x86_64-qnx

### How

Refer https://github.com/eclipse-score/qnx_unit_tests for the infra