Removes experimental tags and stabilizes withAutoCleanupInjectors, AutoCleanupInjectorsFeature,
and RouteReuseStrategy cleanup methods, while re-exporting withExperimentalAutoCleanupInjectors as deprecated.
This commit introduces a new feature to automatically destroy `EnvironmentInjector`s associated with routes that are no longer active or stored. This helps in managing memory by releasing resources held by unused injectors.