refactor(@angular-devkit/core): remove usage of custom deepCopy and deprecate it (#33051)

The custom deepCopy function in @angular-devkit/core is no longer used internally in this package after replacing its usage in registry.ts with the native structuredClone. The function is now marked as deprecated to encourage consumers to migrate to structuredClone, which is supported in modern Node.js versions.

PR Close #33051

Author: clydin

packages/angular_devkit/core/src/json/schema/registry.ts

@@ -13,7 +13,7 @@ import * as https from 'node:https';
 import * as Url from 'node:url';
 import { Observable, from, isObservable, lastValueFrom } from 'rxjs';
 import { BaseException } from '../../exception';
-import { PartiallyOrderedSet, deepCopy } from '../../utils';
+import { PartiallyOrderedSet } from '../../utils';
 import { JsonArray, JsonObject, JsonValue, isJsonObject } from '../utils';
 import {
   JsonPointer,
@@ -257,7 +257,7 @@ export class CoreSchemaRegistry implements SchemaRegistry {
       }
     }
 
-    const schemaCopy = deepCopy(validate.schema as JsonObject);
+    const schemaCopy = structuredClone(validate.schema as JsonObject);
     visitJsonSchema(schemaCopy, visitor);
 
     return schemaCopy;

packages/angular_devkit/core/src/utils/object.ts

@@ -8,6 +8,9 @@
 
 const copySymbol = Symbol();
 
+/**
+ * @deprecated Use `structuredClone` instead.
+ */
 export function deepCopy<T>(value: T): T {
   if (Array.isArray(value)) {
     return value.map((o) => deepCopy(o)) as unknown as T;