feat(source/show): notify when PyPI is implicit

[abn]

Add a notice when all sources are listed and PyPI is implicitly enabled.

Summary by Sourcery

Add a notification to inform users when PyPI is implicitly enabled as a primary source and update tests to verify this behavior.

New Features:

• Add a notification feature to inform users when PyPI is implicitly enabled as a primary source.

Tests:

• Introduce a test to verify the notification for implicit PyPI when no sources are configured.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request introduces a notification feature to inform users when PyPI is implicitly enabled as a primary source in the 'source show' command. It adds a new method to handle this notification and updates the command logic to trigger it appropriately. Additionally, a test case is added to ensure the notification works as expected.

Sequence diagram for source show command with implicit PyPI notification

sequenceDiagram
    actor User
    participant CLI as Poetry CLI
    participant ShowCmd as SourceShowCommand
    participant Pool as Poetry Pool

    User->>CLI: poetry source show
    CLI->>ShowCmd: handle()
    ShowCmd->>ShowCmd: get_sources()
    alt no sources configured
        ShowCmd->>ShowCmd: notify_implicit_pypi()
        ShowCmd->>Pool: has_repository('pypi')
        Pool-->>ShowCmd: true/false
        ShowCmd-->>User: Display implicit PyPI notice
    else sources exist
        loop for each source
            ShowCmd->>ShowCmd: Display source info
        end
        alt PyPI not explicitly configured
            ShowCmd->>ShowCmd: notify_implicit_pypi()
            ShowCmd->>Pool: has_repository('pypi')
            Pool-->>ShowCmd: true/false
            ShowCmd-->>User: Display implicit PyPI notice
        end
    end

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Class diagram for updated SourceShowCommand

classDiagram
    class SourceShowCommand {
        +handle(): int
        +notify_implicit_pypi(): None
    }
    note for SourceShowCommand "Added notify_implicit_pypi() method
to handle PyPI implicit source notification"

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File-Level Changes

Change	Details	Files
Added notification for implicit PyPI source.	Introduced a new method notify_implicit_pypi to handle the notification. Called notify_implicit_pypi in handle method when no sources are configured. Checked if PyPI is implicitly enabled and called notify_implicit_pypi accordingly.	src/poetry/console/commands/source/show.py
Added test for implicit PyPI notification.	Imported PyPiRepository for testing purposes. Added test case test_source_show_no_sources_implicit_pypi to verify the notification when PyPI is implicit.	tests/console/commands/source/test_show.py

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