chore: use `@std` import instead of `@test_util/std` (#22398)

This PR:
1. Replaces `@test_util/std`-prefixed imports with `@std`.
2. Adds `@std/` import map entries to a few `deno.json` files.

1 files changed, 2 insertions, 6 deletions

diff --git a/tests/unit_node/_fs/_fs_readdir_test.ts b/tests/unit_node/_fs/_fs_readdir_test.ts
index eaacbfc5e..b54e15816 100644
--- a/tests/unit_node/_fs/_fs_readdir_test.ts
+++ b/tests/unit_node/_fs/_fs_readdir_test.ts
@@ -1,12 +1,8 @@
 // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
-import {
-  assertEquals,
-  assertNotEquals,
-  fail,
-} from "@test_util/std/assert/mod.ts";
+import { assertEquals, assertNotEquals, fail } from "@std/assert/mod.ts";
 import { assertCallbackErrorUncaught } from "../_test_utils.ts";
 import { readdir, readdirSync } from "node:fs";
-import { join } from "@test_util/std/path/mod.ts";
+import { join } from "@std/path/mod.ts";
 
 Deno.test({
   name: "ASYNC: reading empty directory",