chore(grid, pivot): add deprecation proxy for shouldGenerate to autoGenerate

projects/igniteui-angular/src/lib/grids/grid-base.directive.ts

@@ -2197,9 +2197,15 @@ export abstract class IgxGridBaseDirective implements GridType,
      * ```typescript
      *  this.grid.shouldGenerate = true;
      * ```
-     * @deprecated in version 18.2.0. Use the `autoGenerate` property instead.
+     * @deprecated in version 18.2.0. Column re-creation now relies on `autoGenerate` instead.
      */
-    public shouldGenerate: boolean;
+    public get shouldGenerate(): boolean {
+        return this.autoGenerate;
+    }
+
+    public set shouldGenerate(value: boolean) {
+        this.autoGenerate = value;
+    }
 
     /**
      * Gets/Sets the message displayed when there are no records and the grid is filtered.

projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-grid.component.ts

@@ -745,9 +745,14 @@ export class IgxPivotGridComponent extends IgxGridBaseDirective implements OnIni
 
     /**
      * @hidden @internal
-     * @deprecated in version 18.2.0. Use the `autoGenerate` property instead.
+     * @deprecated in version 18.2.0. This property is no longer supported.
      */
-    public override shouldGenerate: boolean;
+    public override get shouldGenerate(): boolean {
+        return false;
+    }
+
+    public override set shouldGenerate(value: boolean) {
+    }
 
     /**
      * @hidden @internal