[Bug]: Need tests covering static path interpreters

[arrdem]

What happened?

The Python toolchains support fixed external paths, we should have tests covering the venv and binary machinery showing that external interpreters aren't horribly broken for path or toolchain reasons.

Version

Development (host) and target OS/architectures:

Output of bazel --version:

Version of the Aspect rules, or other relevant rules from your
WORKSPACE or MODULE.bazel file:

Language(s) and/or frameworks involved:

How to reproduce

Any other information?

No response