Fixed: usage of owner side / inversed side on SocialAction / Evaluation

In a ManyToMany relationship, doctrine does take care only of the owning
side of a relationship to inspect changes.

([see
documentation](https://www.doctrine-project.org/projects/doctrine-orm/en/current/reference/unitofwork-associations.html#important-concepts))

This commit mark as "internal" the methods add/removeSocialAction on the
inversed side (`Evaluation`) and let the methods add/removeEvaluation
on the owning side (`SocialAction`) update the inversed side.

The usage is also adapted into SocialWorkMetadata's importer.

src/Bundle/ChillPersonBundle/Entity/SocialWork/Evaluation.php

@@ -72,6 +72,9 @@ class Evaluation
         $this->socialActions = new ArrayCollection();
     }
 
+    /**
+     * @internal do use @see{SocialAction::addEvaluation}
+     */
     public function addSocialAction(SocialAction $socialAction): self
     {
         if (!$this->socialActions->contains($socialAction)) {
@@ -111,6 +114,11 @@ class Evaluation
         return $this->url;
     }
 
+    /**
+     * @return $this
+     *
+     * @internal do use @see{SocialAction::removeEvaluation}
+     */
     public function removeSocialAction(SocialAction $socialAction): self
     {
         if ($this->socialActions->contains($socialAction)) {

src/Bundle/ChillPersonBundle/Entity/SocialWork/SocialAction.php

@@ -112,6 +112,7 @@ class SocialAction
     {
         if (!$this->evaluations->contains($evaluation)) {
             $this->evaluations[] = $evaluation;
+            $evaluation->addSocialAction($this);
         }
 
         return $this;
@@ -310,6 +311,7 @@ class SocialAction
     public function removeEvaluation(Evaluation $evaluation): self
     {
         $this->evaluations->removeElement($evaluation);
+        $evaluation->removeSocialAction($this);
 
         return $this;
     }

src/Bundle/ChillPersonBundle/Service/Import/SocialWorkMetadata.php

@@ -193,7 +193,7 @@ final class SocialWorkMetadata implements SocialWorkMetadataInterface
         /** @var Evaluation $eval */
         $eval = $this->getOrCreateEntity($this->evaluationRepository, 'title', ['fr' => $evaluationTitle]);
         $eval->setTitle(['fr' => $evaluationTitle]);
-        $eval->addSocialAction($socialAction);
+        $socialAction->addEvaluation($eval);
 
         $this->entityManager->persist($eval);