fix(machine-clone) : preserve context field values when cloning a machine

Context CustomFieldValues attached to component/piece links were
silently dropped from the clone response (and from any subsequent
read in the same request) because the controller persisted the new
CFVs without adding them to the inverse-side collection of the new
link. Doctrine does not auto-sync inverse OneToMany associations,
so getContextFieldValues() returned an empty collection on the
freshly persisted link.

Also synchronise the inverse collection in the test factory so
identity-mapped entities reflect newly-created CFVs when reused
by request handlers within the same test.

Co-Authored-By: RuFlo <ruv@ruv.net>

src/Controller/MachineStructureController.php

@@ -337,6 +337,7 @@ class MachineStructureController extends AbstractController
                 $newValue->setMachineComponentLink($newLink);
                 $newValue->setComposant($newLink->getComposant());
                 $this->entityManager->persist($newValue);
+                $newLink->getContextFieldValues()->add($newValue);
             }
         }
 
@@ -352,6 +353,7 @@ class MachineStructureController extends AbstractController
                 $newValue->setMachinePieceLink($newLink);
                 $newValue->setPiece($newLink->getPiece());
                 $this->entityManager->persist($newValue);
+                $newLink->getContextFieldValues()->add($newValue);
             }
         }
     }