minor #7206 Fix some deprecations related to Doctrine (javiereguiluz)

This PR was squashed before being merged into the 4.x branch.

Discussion
----------

Fix some deprecations related to Doctrine

Fixes these:

```
User Deprecated: Using ArrayAccess on Doctrine\ORM\Mapping\FieldMapping
is deprecated and will not be possible in Doctrine ORM 4.0.
Use the corresponding property instead.
(ArrayAccessImplementation.php:31 called by CommonPreConfigurator.php:231,
doctrine/orm#11211, package doctrine/orm)

User Deprecated: Using ArrayAccess on Doctrine\ORM\Mapping\FieldMapping
is deprecated and will not be possible in Doctrine ORM 4.0.
Use the corresponding property instead.
(ArrayAccessImplementation.php:31 called by DateTimeConfigurator.php:101,
doctrine/orm#11211, package doctrine/orm)
```

Commits
-------

c32a422 Fix some deprecations related to Doctrine

Author: javiereguiluz

src/Field/Configurator/CommonPreConfigurator.php

@@ -3,6 +3,7 @@
 namespace EasyCorp\Bundle\EasyAdminBundle\Field\Configurator;
 
 use Doctrine\DBAL\Types\Types;
+use Doctrine\ORM\Mapping\FieldMapping;
 use Doctrine\ORM\Mapping\JoinColumnMapping;
 use EasyCorp\Bundle\EasyAdminBundle\Config\Action;
 use EasyCorp\Bundle\EasyAdminBundle\Config\Crud;
@@ -227,12 +228,16 @@ private function buildRequiredOption(FieldDto $field, EntityDto $entityDto): boo
 
         // TODO: check if it's correct to never make a boolean value required
         // I guess it's correct because Symfony Forms treat NULL as FALSE by default (i.e. in the database the value won't be NULL)
-        if (isset($entityDto->getClassMetadata()->fieldMappings[$field->getProperty()])
-            && Types::BOOLEAN === $entityDto->getClassMetadata()->getFieldMapping($field->getProperty())['type']) {
+        // Doctrine ORM 2.x returns an array and Doctrine ORM 3.x returns a FieldMapping object
+        $fieldMapping = $entityDto->getClassMetadata()->getFieldMapping($field->getProperty());
+        // @phpstan-ignore-next-line (backward compatibility with Doctrine ORM 2.x)
+        $fieldType = \is_array($fieldMapping) ? ($fieldMapping['type'] ?? null) : $fieldMapping->type;
+        if (Types::BOOLEAN === $fieldType && isset($entityDto->getClassMetadata()->fieldMappings[$field->getProperty()])) {
             return false;
         }
 
-        $nullable = $entityDto->getClassMetadata()->fieldMappings[$field->getProperty()]['nullable'];
+        // @phpstan-ignore-next-line (backward compatibility with Doctrine ORM 2.x)
+        $nullable = \is_array($fieldMapping) ? ($fieldMapping['nullable'] ?? null) : $fieldMapping->nullable;
 
         return false === $nullable || null === $nullable;
     }

src/Field/Configurator/DateTimeConfigurator.php

@@ -3,6 +3,7 @@
 namespace EasyCorp\Bundle\EasyAdminBundle\Field\Configurator;
 
 use Doctrine\DBAL\Types\Types;
+use Doctrine\ORM\Mapping\FieldMapping;
 use EasyCorp\Bundle\EasyAdminBundle\Context\AdminContext;
 use EasyCorp\Bundle\EasyAdminBundle\Contracts\Field\FieldConfiguratorInterface;
 use EasyCorp\Bundle\EasyAdminBundle\Contracts\Intl\IntlFormatterInterface;
@@ -96,8 +97,11 @@ public function configure(FieldDto $field, EntityDto $entityDto, AdminContext $c
         }
 
         $fieldMapping = $entityDto->getClassMetadata()->getFieldMapping($field->getProperty());
+        // Doctrine ORM 2.x returns an array and Doctrine ORM 3.x returns a FieldMapping object
+        // @phpstan-ignore function.impossibleType, nullCoalesce.offset (backward compatibility with Doctrine ORM 2.x)
+        $fieldType = \is_array($fieldMapping) ? ($fieldMapping['type'] ?? null) : $fieldMapping->type;
 
-        $isImmutableDateTime = \in_array($fieldMapping['type'], [Types::DATETIMETZ_IMMUTABLE, Types::DATETIME_IMMUTABLE, Types::DATE_IMMUTABLE, Types::TIME_IMMUTABLE], true);
+        $isImmutableDateTime = \in_array($fieldType, [Types::DATETIMETZ_IMMUTABLE, Types::DATETIME_IMMUTABLE, Types::DATE_IMMUTABLE, Types::TIME_IMMUTABLE], true);
         if ($isImmutableDateTime) {
             $field->setFormTypeOptionIfNotSet('input', 'datetime_immutable');
         }