Once Rob Bovill has the integration test for [C++, java, Python] <-> [C++, java, Python] SAL communication working, remove all use of SALPY from ts_salobj.

Specifically:

• Remove the two test_x_to_either.py tests and the two associated minimal controllers.
• Remove ts_sal as a dependency in the ups table
• Update the documentation to remove all reference to SALPY.
• Update Jenkinsfile to remove commands:/pytest --ignore tests/test_salpy_to_either.py ...
• Update conda/meta.yaml to remove make_salpy_libs.py Test

Do a global search for SALPY and "_to_either" for any other things to delete.