Add and test DeleteAllTenantMappings, use the listener on TenantDeleted in TSP stub by default

assets/TenancyServiceProvider.stub.php

@@ -78,6 +78,7 @@ class TenancyServiceProvider extends ServiceProvider
             Events\TenantDeleted::class => [
                 JobPipeline::make([
                     Jobs\DeleteDatabase::class,
+                    ResourceSyncing\Listeners\DeleteAllTenantMappings::class,
                 ])->send(function (Events\TenantDeleted $event) {
                     return $event->tenant;
                 })->shouldBeQueued(false),