Refactor: Use environment variables for URLs and @Autowired for injection

Instead of hardcoding URLs for owners/createOrUpdateOwnerForm and pets/createOrUpdatePetForm in the code,
introduce environment variables for these values. Removed the static final type to allow injection.

Also, replaced constructor injection with @Autowired annotation for OwnerRepository to reduce lines of code.

src/main/java/org/springframework/samples/petclinic/owner/OwnerController.java

@@ -32,6 +32,8 @@ import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.servlet.ModelAndView;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
 
 import jakarta.validation.Valid;
 

src/main/java/org/springframework/samples/petclinic/owner/PetController.java

@@ -29,6 +29,8 @@ import org.springframework.web.bind.annotation.ModelAttribute;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
 
 import jakarta.validation.Valid;
 

src/main/resources/application.properties

@@ -26,4 +26,4 @@ spring.web.resources.cache.cachecontrol.max-age=12h
 
 # Environment Variables
 views.owner.createOrUpdateForm=owners/createOrUpdateOwnerForm
-views.pets.createOrUpdateForm=pets/createOrUpdatePetForm
+views.pets.createOrUpdateForm=pets/createOrUpdatePetForm