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 happened when using ->contains(). Running psalm emitted

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

We should either not define @template TMaybeContained or re-define
the psalm docblock from ReadableCollection completely.

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

psalm-baseline.xml

@@ -251,9 +251,6 @@
     </UnsupportedReferenceUsage>
   </file>
   <file src="src/Internal/Hydration/ObjectHydrator.php">
-    <InvalidArgument>
-      <code><![CDATA[$element]]></code>
-    </InvalidArgument>
     <PossiblyFalseArgument>
       <code><![CDATA[$index]]></code>
     </PossiblyFalseArgument>

src/LazyCriteriaCollection.php

@@ -64,11 +64,7 @@ public function isEmpty(): bool
     }
 
     /**
-     * {@inheritDoc}
-     *
      * Do an optimized search of an element
-     *
-     * @template TMaybeContained
      */
     public function contains(mixed $element): bool
     {

src/PersistentCollection.php

@@ -350,11 +350,6 @@ public function containsKey(mixed $key): bool
         return parent::containsKey($key);
     }
 
-    /**
-     * {@inheritDoc}
-     *
-     * @template TMaybeContained
-     */
     public function contains(mixed $element): bool
     {
         if (! $this->initialized && $this->getMapping()->fetch === ClassMetadata::FETCH_EXTRA_LAZY) {