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fix: Composer plugins can be removed when in custom/plugins

fix: Composer plugins can be removed when in custom/plugins: a task in bird-critic-1.5-full-300 (Harbor dataset). Deleting a plugin refuses to touch anything that Composer manages, which is right for a plugin shipped in vendor/ — its files belong to Composer, not to the shop. But the check is only…

The task

Deleting a plugin refuses to touch anything that Composer manages, which is right for a plugin shipped in `vendor/` — its files belong to Composer, not to the shop. But the check is only on the `managedByComposer` flag, and when `executeComposerCommands` is enabled that flag is set even for plugins the merchant…

Part of kochsnow/bird-critic-1.5-full-300.