Add persistent object cache support

[swissspidy]

Optionally use SQLite Object Cache to run tests with a persistent object cache.

Related:

• Implement network-specific metadata handling in commands. entity-command#518

[github-actions]

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the testing capabilities by adding support for persistent object caching in the test environment. It allows for more comprehensive testing of WordPress installations, particularly those leveraging SQLite for both database and object caching, by automating the setup and configuration of the SQLite Object Cache plugin. This ensures that WP-CLI commands behave as expected in environments with external object caches.

Highlights

• Persistent Object Cache Testing: Introduced a new Behat scenario and supporting infrastructure to test WordPress installations with persistent object cache enabled, specifically using the SQLite Object Cache plugin.
• SQLite Object Cache Integration: Implemented functionality to download, extract, and configure the SQLite Object Cache plugin within the testing environment when the WP_CLI_TEST_OBJECT_CACHE environment variable is set to 'sqlite'.
• Test Environment Setup Enhancements: Modified the WordPress installation and caching logic to properly account for and configure the object cache, including defining WP_CACHE_KEY_SALT and ensuring unique cache paths for object cache-enabled test runs.
• Robust File Copying: Improved the dir_diff_copy utility function to gracefully handle scenarios where files might vanish during the copy process or target directories do not exist, enhancing the stability of test setups.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 43 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/Context/FeatureContext.php	0.00%	43 Missing ⚠️

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