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In [56765], theme block pattern files were cached to a transient as a performance enhancement. However, transients are not easily clearable when caches are flushed on environments not using a persistent cache, which can lead to errors if the theme files are renamed, edited, or moved. This changes the caching mechanism to use `wp_cache_set()` instead, and caches these values to the global group so they are still persistent on environments using an object cache, and will be cleared by a cache flush. In addition, the helper `_wp_get_block_patterns` has been moved `WP_Theme::get_block_patterns` for consistency with other block related theme methods and cache helpers for these values, `WP_Theme::get_pattern_cache` and `WP_Theme::set_pattern_cache`, have been made private. Relevant unit tests updated. Props afercia, flixos90, mukesh27, joemcgill. Merges [56978] to the 6.4 branch. Fixes #59633. See #59591, #59490. git-svn-id: https://develop.svn.wordpress.org/branches/6.4@56979 602fd350-edb4-49c9-b593-d223f7449a82