115284: Add repeatable based on relationship max cardinality

(cherry picked from commit 1055475)

Author: YanaDePauw

src/app/item-page/edit-item-page/item-relationships/edit-relationship-list/edit-relationship-list.component.ts

@@ -264,6 +264,22 @@ export class EditRelationshipListComponent implements OnInit, OnDestroy {
     return update && update.field ? update.field.uuid : undefined;
   }
 
+  /**
+   * Check whether the current entity can have multiple relationships of this type
+   * This is based on the max cardinality of the relationship
+   * @private
+   */
+  private isRepeatable(): boolean {
+    const isLeft = this.currentItemIsLeftItem$.getValue();
+    if (isLeft) {
+      const leftMaxCardinality = this.relationshipType.leftMaxCardinality;
+      return hasNoValue(leftMaxCardinality) || leftMaxCardinality > 1;
+    } else {
+      const rightMaxCardinality = this.relationshipType.rightMaxCardinality;
+      return hasNoValue(rightMaxCardinality) || rightMaxCardinality > 1;
+    }
+  }
+
   /**
    * Open the dynamic lookup modal to search for items to add as relationships
    */
@@ -281,6 +297,7 @@ export class EditRelationshipListComponent implements OnInit, OnDestroy {
     modalComp.toAdd = [];
     modalComp.toRemove = [];
     modalComp.isPending = false;
+    modalComp.repeatable = this.isRepeatable();
     modalComp.hiddenQuery = '-search.resourceid:' + this.item.uuid;
 
     this.item.owningCollection.pipe(