Upgrade to D11

Known D11 incompatibilities and deprecations have @todo D11 code comments.

Before initial deployment

• In drupalorg_filter_secure_image_alter(), replace call to filter_filter_secure_image_alter() with the current hook attribute.

Deprecations

Don’t block upgrade to D11, do block D12 upgrade.

• Hook removal in drupalorg_module_implements_alter() can use a #[RemoveHook] attribute instead. See https://www.drupal.org/node/3496786