bug #35728 Add missing autoload calls (greg0ire)

This PR was merged into the 4.4 branch.

Discussion
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Add missing autoload calls

Until either php 7.4 or doctrine/persistence 2 is required, these will
be needed to make sure php recognises signatures using the old names as
compatible with signatures using the new names.
This is necessary for types defined outside Symfony that extend types
from Symfony and still use the old names in signatures of methods they
override.

Fixes https://github.com/doctrine/DoctrineMongoDBBundle/issues/616

| Q             | A
| ------------- | ---
| Branch?       | 4.3
| Bug fix?      | yes
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | Fix https://github.com/doctrine/DoctrineMongoDBBundle/issues/616
| License       | MIT
| Doc PR        | n/a
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Additionally (see https://symfony.com/releases):
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This topic is fairly complicated, more details at https://dev.to/greg0ire/how-to-deprecate-a-type-in-php-48cf

Commits
-------

94b5dbde5a Add missing autoload calls

src/Symfony/Bridge/Doctrine/Form/Type/DoctrineType.php

@@ -282,3 +282,5 @@ abstract class DoctrineType extends AbstractType implements ResetInterface
         $this->choiceLoaders = [];
     }
 }
+
+interface_exists(ObjectManager::class);

src/Symfony/Bridge/Doctrine/Form/Type/EntityType.php

@@ -97,3 +97,5 @@ class EntityType extends DoctrineType
         return [$parameter->getName(), $parameter->getType(), $parameter->getValue()];
     }
 }
+
+interface_exists(ObjectManager::class);

src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php

@@ -153,3 +153,6 @@ class EntityUserProvider implements UserProviderInterface, PasswordUpgraderInter
         return $this->getObjectManager()->getClassMetadata($this->classOrAlias);
     }
 }
+
+interface_exists(ObjectManager::class);
+interface_exists(ObjectRepository::class);