refactor: fix crud grid hide edit column usage (#8338)

Author: tomivirkki

packages/crud/src/vaadin-crud-grid-mixin.d.ts

@@ -36,4 +36,10 @@ export declare class CrudGridMixinClass {
    * @attr {boolean} no-head
    */
   noHead: boolean | null | undefined;
+
+  /**
+   * Determines whether the edit column should be hidden.
+   * @attr {boolean} hide-edit-column
+   */
+  hideEditColumn: boolean | null | undefined;
 }

packages/crud/src/vaadin-crud-grid-mixin.js

@@ -39,8 +39,13 @@ export const CrudGridMixin = (superClass) =>
          */
         noHead: Boolean,
 
-        /** @private */
-        __hideEditColumn: Boolean,
+        /**
+         * Determines whether the edit column should be hidden.
+         * @attr {boolean} hide-edit-column
+         */
+        hideEditColumn: {
+          type: Boolean,
+        },
       };
     }