Apply system Python filtering to executable name requests #4309
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Executable name requests were being treated as explicit requests to install into system environments, but I don't think it should be as it's implicit what environment you'll end up in. Following #4308, we allow multiple executables to be found so we can filter here.
Concretely, this means
--system
is required to install into a system environment discovered with e.g.--python=python
. The flag is still not required for cases where we're not mutating environment.