review license setup on dev_tools/language_server/tests/conftest.py

https://github.com/apache/hamilton/blob/e0333384a3d10c72d78540c521f836f06688a696/dev_tools/language_server/tests/conftest.py#L4

There is no ThirdPartyNotices.txt

* The whole comment seems like it needs to be fixed up.
* We need to update our LICENSE file to mention this file and its license

@skrawcz could you or another nominated PPMC member find out where this file originates and what the original source code headers were. We also need to work out which bits are MIT licensed and which are Apache licensed.