tests: make test independent of system pythons

[radoering]

The column width of the output may vary depending on the available system pythons.

Pull Request Check List

Resolves: #10796

• Added tests for changed code.
• Updated documentation for changed code.

[sourcery-ai]

Hey - I've left some high level feedback:

• The inline loop that manually registers poetry-managed interpreters in test_list_poetry_managed is fairly verbose and duplicates knowledge about the directory structure and flags; consider extracting a small helper fixture or function to encapsulate this setup so the test focuses on behavior rather than filesystem details.
• You now build expected_system and expected_poetry sets directly from hard-coded strings; if the output formatting changes (e.g., column widths or labels), these assertions may become brittle—consider deriving expected lines from the same parameters used for registration (versions, implementations, paths) or using a looser comparison that validates the key fields without depending on spacing.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The inline loop that manually registers poetry-managed interpreters in `test_list_poetry_managed` is fairly verbose and duplicates knowledge about the directory structure and flags; consider extracting a small helper fixture or function to encapsulate this setup so the test focuses on behavior rather than filesystem details.
- You now build `expected_system` and `expected_poetry` sets directly from hard-coded strings; if the output formatting changes (e.g., column widths or labels), these assertions may become brittle—consider deriving expected lines from the same parameters used for registration (versions, implementations, paths) or using a looser comparison that validates the key fields without depending on spacing.

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