[CI/Build] Verify licenses

[derekk-nm]

Add a test case to verify that the expected licenses are included in the package distribution location.

[andy-neuma]

cool. thanks.

[derekk-nm]

the one job that failed has test case failures that are issues under investigation.

=========================== short test summary info ============================
FAILED tests/models/test_gptq_marlin.py::test_models[5-32-half-model1] - AssertionError: Test1:
gptq:	'Briefly describe the major milestones in the development of artificial intelligence from 1950 to 2020. What are the major'
gptq_marlin:	'Briefly describe the major milestones in the development of artificial intelligence from 1950 to 2020. (10 points'
FAILED tests/models/test_gptq_marlin.py::test_models[5-32-bfloat16-model1] - AssertionError: Test3:
gptq:	'Describe the basic components of a neural network and how it can be trained. Neural networks are a type of machine learning algorithm that is inspired by the human'
gptq_marlin:	'Describe the basic components of a neural network and how it can be trained. (a) A neural network is a computational model that is inspired by the bi'
======== 2 failed, 14 passed, 22 warnings, 6 rerun in 472.43s (0:07:52) ========

The license tests ran, and reported as passed:

platform linux -- Python 3.8.17, pytest-8.2.2, pluggy-1.5.0
rootdir: /opt/actions-runner/_work/nm-vllm/nm-vllm
configfile: pyproject.toml
plugins: cov-5.0.0, forked-1.6.0, asyncio-0.23.7, anyio-4.4.0, shard-0.1.2, xdist-3.6.1, rerunfailures-14.0
asyncio: mode=strict
collected 13 items
Running 13 items in this shard

neuralmagic/tests/test_nm-vllm_licenses.py .............                 [100%]

- generated xml file: /opt/actions-runner/_work/nm-vllm/nm-vllm/test-results/test_nm-vllm_licenses.xml -
============================== 13 passed in 2.92s ==============================