fix: inherit parent process env in Python discovery subprocess

[IzaakGough]

Fixes #7397

This PR ensures that the Python discovery sub-process inherits environment variables from the parent process rather than ignoring them.

Testing

• Manually verified that this fixes the bug from the issue
• Automated tests pass

[gemini-code-assist]

Code Review

This pull request updates the Python runtime delegate to inherit the parent shell environment (process.env) when executing discovery subprocesses in modulesDir() and serveAdmin(), and adds corresponding unit tests. A review comment identifies a TypeScript compilation error in serveAdmin() where spreading process.env directly results in an incompatible type, and suggests casting it to Record<string, string> to resolve the issue.

[cabljac]

Thanks @IzaakGough, the approach is right and the tests are a good addition. Requesting changes for one issue: the debug log now dumps the entire parent shell env into firebase-debug.log (details inline).

[wandamora]

Could we potentially merge process.env here within runWithVirtualEnv instead of spreading it in every caller? It could reduce the redundant boilerplate and prevent existing and future callers from forgetting to include it.

[IzaakGough]

Really good catch, thanks! I will make these changes now

[wiz-9635d3485b]

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[wandamora]

LGTM for google review.