Add --inactive flag to wp sidebar list and wp widget reset

[Copilot]

• Explore codebase and understand implementation
• Add --inactive flag to wp sidebar list to list unregistered/orphaned sidebars
• Add --inactive flag to wp widget reset to reset all unregistered sidebars
• Fix wp_inactive_widgets exclusion bug in wp widget reset
• Update error message for wp widget reset with no args to mention --inactive
• Add Behat test for wp sidebar list --inactive
• Add Behat test for wp widget reset --inactive
• Refactor: move get_inactive_sidebar_ids() to Sidebar_Command as public static method; remove duplicate from Widget_Command
• Run lint, phpcs, phpstan — all pass

Original prompt

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This section details on the original issue you should resolve

<issue_title>List all inactive sidebars on a site.</issue_title>
<issue_description>Background: We have a network of sites that did some crazy things in the past and now have hundreds of inactive sidebars each filled with a dozen or more widgets.

Desired functionality: We would like to remove all widgets in inactive sidebars via cli. I considered writing a custom cli to do this, but I thought that this might be a common enough problem to warrant adding to the wp widget or wp sidebar commands.

Questions:
Is this something that would be worth adding?
How should this be added?

Possible solutions: (please adjust as needed)
$ wp widget reset (wp sidebar list --filter=inactive )
or
$ wp widget reset (wp sidebar list --inactive )
or
$ wp widget reset --inactive
or
$ wp widget reset --all-inactive
</issue_description>

Comments on the Issue (you are @copilot in this section)

@danielbachhuber This seems like a reasonable improvement! I don't have any strong opinions on the implementation; I'd need to refresh myself on the widget internals.

• Fixes List all inactive sidebars on a site. #38

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[codecov]

Codecov Report

❌ Patch coverage is 96.29630% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/Sidebar_Command.php	96.66%	1 Missing ⚠️
src/Widget_Command.php	95.83%	1 Missing ⚠️

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