JPA endpoints throw CNFE if an EntityManageFactory cannot be resolved

### Bug description

If no `EntityManagerFactory` could be resolved, the JPA component attempts to create its own via `LocalEntityManagerFactoryBean`. However, we exclude `spring-orm`, so this cannot work.

I am planning to work around this in https://github.com/apache/camel-quarkus/issues/7315.

But we need a more robust permanent solution where we can override `JpaEndpoint.createEntityManagerFactory` and throw an exception.

```
Caused by: java.lang.NoClassDefFoundError: org/springframework/orm/jpa/LocalEntityManagerFactoryBean
at org.apache.camel.component.jpa.JpaEndpoint.createEntityManagerFactory(JpaEndpoint.java:572)
at org.apache.camel.component.jpa.JpaEndpoint.getEntityManagerFactory(JpaEndpoint.java:238)
at org.apache.camel.quarkus.component.jpa.it.JpaResource.createJpaEndpoint(JpaResource.java:152)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:154)
at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:118)
at org.jboss.resteasy.core.ResourceMethodInvoker.internalInvokeOnTarget(ResourceMethodInvoker.java:560)
at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTargetAfterFilter(ResourceMethodInvoker.java:452)
at org.jboss.resteasy.core.ResourceMethodInvoker.lambda$invokeOnTarget$2(ResourceMethodInvoker.java:413)
at org.jboss.resteasy.core.interception.jaxrs.PreMatchContainerRequestContext.filter(PreMatchContainerRequestContext.java:321)
at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:415)
at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:378)
at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:356)
at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:70)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:429)
... 17 more
Caused by: java.lang.ClassNotFoundException: org.springframework.orm.jpa.LocalEntityManagerFactoryBean
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:576)
at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:523)
... 32 more
```