pods: Keep ports aligned with their errors in PodCreateModal

The "publish" and "validationFailed.publish" arrays must always be
aligned. The "validateForm" function was erronously filtering out
undefined entries in validationFailed.publish.

Those undefined entries correspond to empty slots in the "publish"
array and are left behind by the DynamicListForm component when
removing rows in the UI. It does that for its own convenience and we
must respect that.

The observable result of filtering out these entries was that
validation errors would shift to unrelated publish entries. If that
unrelated entry was a empty slot, it would thereafter never be updated
and keep its validation error forever, which would keep the "Create"
button disabled forever.

src/PodCreateModal.jsx

@@ -129,7 +129,7 @@ export const PodCreateModal = ({ user, systemServiceAvailable, userServiceAvaila
             };
         });
         if (publishValidation.some(entry => entry && Object.keys(entry).length > 0))
-            newValidationFailed.publish = publishValidation.filter(entry => entry !== undefined);
+            newValidationFailed.publish = publishValidation;
 
         const podNameValidation = validatePodName(podName);