[PHP 7.4] Improve TypedPropertyRector for Doctrine collection

[TomasVotruba]

Before Doctrine Collections were Skipped

<?php

namespace Rector\Php74\Tests\Rector\Property\TypedPropertyRector\Fixture;

use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
use Pehapkari\Training\Entity\TrainingTerm;

/**
 * @ORM\Entity
 */
class DoctrineCollection
{
    /**
     * @ORM\OneToMany(targetEntity="Pehapkari\Training\Entity\TrainingTerm", mappedBy="training")
     * @var TrainingTerm[]&Collection
     */
    private $trainingTerms;
}

Now The Collection Type is Used and Annotation Kept, to add more info

<?php

namespace Rector\Php74\Tests\Rector\Property\TypedPropertyRector\Fixture;

use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
use Pehapkari\Training\Entity\TrainingTerm;

/**
 * @ORM\Entity
 */
class DoctrineCollection
{
    /**
     * @ORM\OneToMany(targetEntity="Pehapkari\Training\Entity\TrainingTerm", mappedBy="training")
     * @var TrainingTerm[]&Collection
     */
-   private $trainingTerms;
+   private Collection $trainingTerms;
}