Remove unused Vets object from VetController showVetList method

[marcosgdz03]

🐛 Fix unused Vets object in VetController

Closes #2333

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📌 Description

This PR removes an unused Vets object from the showVetList method in VetController.

Previously, a Vets instance was created and populated but never used or added to the model:

Vets vets = new Vets();
Page<Vet> paginated = findPaginated(page);
vets.getVetList().addAll(paginated.toList());
return addPaginationModel(page, paginated, model);