#[OnDeactivation]
Attribute on methods.
Runs the method when the plugin is deactivated or the site switches away from the theme (or child theme).
A plugin runs it in the request that deactivates it (deactivate_{plugin});
network-wide deactivation runs it once per site. A theme runs it in the
request that switches (switch_theme), unless the new theme is this theme
or its child theme. Afterwards the framework removes the cron events and
tasks of the instance. The method is public, returns void and takes services
only.