Avoid triggering deprecation when calling UnitOfWork::clear()

[franmomu]

Q	A
Type	task
BC Break	no
Fixed issues

Summary

When calling UnitOfWork::clear() without argument it always triggers a deprecation (using doctrine/persistence 3) because it's passing a value to OnClearEventArgs::__construct():

mongodb-odm/lib/Doctrine/ODM/MongoDB/Event/OnClearEventArgs.php

Lines 28 to 48 in 5ea5b1d

	/** @param class-string|null $entityClass */
	public function __construct($objectManager, $entityClass = null)
	{
	if (method_exists(parent::class, 'getEntityClass') && $entityClass !== null) {
	parent::__construct($objectManager, $entityClass);
	} else {
	if (func_num_args() > 1) {
	trigger_deprecation(
	'doctrine/mongodb-odm',
	'2.4',
	'Passing $entityClass argument to %s::%s() is deprecated and will not be supported in Doctrine ODM 3.0.',
	self::class,
	__METHOD__,
	);
	}
	parent::__construct($objectManager);
	}
	$this->entityClass = $entityClass;
	}

The deprecation can be seen in https://github.com/doctrine/DoctrineMongoDBBundle/actions/runs/4363102968/jobs/7628786971#step:10:30