Allow Rose Apps to set PYTHONPATH=_PYTHONPATH before running #2725
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Allows Cylc Wrapper to cached the users PYTHONPATH before switching to a Cylc 8 environment.
Partner of cylc/cylc-flow#5727
The Rose end of cylc/cylc-flow#5124
Tagging @dpmatthews who may want to be involved in functionally testing this, although I'll propose a user test when I put up a companion PR for Cylc. Probably won't want to be a main reviewer.
This PR is self-sufficient. It won't break anything if it goes in without the companion Cylc PR.