Fix psalm errors: remove override of template type

See doctrine/collections#368 for the same
issue in doctrine/collections which has been fixed there.

The issue happens when using ->contains(). Running psalm emits

  > InvalidArgument - Argument 1 of Doctrine\ORM\PersistentCollection::contains
  > expects
  > TMaybeContained:fn-doctrine\common\collections\readablecollection::contains
  > as mixed, but … provided.

Solution: we should either not define @template TMaybeContained or
re-define the complete psalm docblock from ReadableCollection.

Repairing the docblock necessitates an update to the psalm baseline:
one "known issue" is no longer an issue and thus removed.

psalm-baseline.xml

@@ -462,9 +462,6 @@
     </RedundantConditionGivenDocblockType>
   </file>
   <file src="src/Internal/Hydration/ObjectHydrator.php">
-    <InvalidArgument>
-      <code><![CDATA[$element]]></code>
-    </InvalidArgument>
     <PossiblyFalseArgument>
       <code><![CDATA[$index]]></code>
     </PossiblyFalseArgument>

src/LazyCriteriaCollection.php

@@ -76,11 +76,9 @@ public function isEmpty()
     }
 
     /**
-     * {@inheritDoc}
-     *
      * Do an optimized search of an element
      *
-     * @template TMaybeContained
+     * @return bool TRUE if the collection contains $element, FALSE otherwise.
      */
     public function contains($element)
     {

src/PersistentCollection.php

@@ -412,11 +412,6 @@ public function containsKey($key): bool
         return parent::containsKey($key);
     }
 
-    /**
-     * {@inheritDoc}
-     *
-     * @template TMaybeContained
-     */
     public function contains($element): bool
     {
         if (! $this->initialized && $this->getMapping()['fetch'] === ClassMetadata::FETCH_EXTRA_LAZY) {