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8a042667 - [ty] Allow discovering dependencies in system Python environments (#22994)

[ty] Allow discovering dependencies in system Python environments (#22994) ## Summary Fixes https://github.com/astral-sh/ty/issues/2068. This change allows ty to discover and use dependencies installed in system Python environments where ty itself is installed. The subtlety here is in the case where we discover a local `.venv` AND ty is installed in a different Python env. In this case, we prioritize the local `.venv`, to avoid false-negatives due to accidental reliance on globally installed packages. ## Test Plan Added test; existing tests continue to pass. Co-authored-by: Claude <noreply@anthropic.com>