tests: add test for cyclic self-referential dependencies

[radoering]

Pull Request Check List

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

Summary by Sourcery

Add tests to ensure the dependency solver handles cyclic self-referential extras correctly

Tests:

• Add a "cyclic" extras group to test_solver_returns_extras_if_requested_in_multiple_groups
• Add reciprocal "cyclic" and "cyclic2" entries to test_solver_resolves_self_referential_extras to simulate self-referential dependency cycles

[sourcery-ai]

Reviewer's Guide

This PR enhances the solver’s test suite by introducing scenarios for cyclic self-referential extras, ensuring that the solver can detect and correctly resolve cycles in extra dependency definitions.

File-Level Changes

Change	Details	Files
Add cyclic extras scenario to group-based extra inclusion tests	Insert ("cyclic", ...) case in test_solver_returns_extras_if_requested_in_multiple_groups	tests/puzzle/test_solver.py
Extend self-referential extras resolution tests with cyclic mapping	Add "cyclic" and "cyclic2" groups to extras mapping Assert solver resolves the cyclic references and includes base packages	tests/puzzle/test_solver.py

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[sourcery-ai]

Hey @radoering - I've reviewed your changes and they look great!

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[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.