Issue #3428482 by jsacksick: D11 compatibility, cspell & phpstan fixes.

.gitlab-ci.yml

commerce_recurring.api.php

commerce_recurring.info.yml

commerce_recurring.post_update.php

composer.json

.../views.view.commerce_subscription_initial_order_admin.yml

...install/views.view.commerce_subscription_orders_admin.yml

...tall/views.view.commerce_subscription_orders_customer.yml

config/install/views.view.commerce_user_subscriptions.yml

src/Entity/BillingSchedule.php

src/Entity/Subscription.php

src/Entity/SubscriptionInterface.php

src/EventSubscriber/DunningSubscriber.php

src/EventSubscriber/OrderSubscriber.php

src/EventSubscriber/ReferenceablePluginTypesSubscriber.php

src/Form/BillingScheduleForm.php

src/Form/SubscriptionForm.php

...Plugin/Commerce/SubscriptionType/SubscriptionTypeBase.php

...n/Commerce/SubscriptionType/SubscriptionTypeInterface.php

src/Plugin/Field/FieldType/ScheduledChangeItemList.php