This rule help you to remove the deprecated core bundle from sonata admin project.

rector-sonata-core-bundle.php

<?php

$parameters = $containerConfigurator->parameters();
$parameters->set(Option::SKIP, [
        StringClassNameToClassConstantRector::class => [
            __DIR__ . '/rector.php',
        ],
]);

// it need to be used with rector php: https://github.com/rectorphp/rector
$services = $containerConfigurator->services();
$services->set(RenameNamespaceRector::class)
        ->configure([
            'Sonata\CoreBundle\Model\ManagerInterface' => 'Sonata\Doctrine\Model\ManagerInterface',
            'Sonata\CoreBundle\Form\Type\CollectionType' => 'Sonata\Form\Type\CollectionType',
            'Sonata\CoreBundle' => '\Please\Do\Not\Use\Things\From\SonataCoreBundle',
        ]);