Enable deletion of relation fields (#5338)

In this PR
1. Enable deletion of relation fields in the product and via the api
(migration part was missing in the api)
3. Change wording, only use "deactivate" and "delete" everywhere (and
not a mix of the two + "disable", "erase")

packages/twenty-front/src/modules/object-metadata/graphql/mutations.ts

@@ -139,3 +139,11 @@ export const DELETE_ONE_FIELD_METADATA_ITEM = gql`
     }
   }
 `;
+
+export const DELETE_ONE_RELATION_METADATA_ITEM = gql`
+  mutation DeleteOneRelationMetadataItem($idToDelete: UUID!) {
+    deleteOneRelation(input: { id: $idToDelete }) {
+      id
+    }
+  }
+`;

packages/twenty-front/src/modules/object-metadata/graphql/queries.ts

@@ -68,6 +68,7 @@ export const FIND_MANY_OBJECT_METADATA_ITEMS = gql`
                 defaultValue
                 options
                 relationDefinition {
+                  relationId
                   direction
                   sourceObjectMetadata {
                     id