doc: fix missing imports in test.run code examples

The script was missing necessary imports for the `run`
function and the `path` module, causing it to fail.
This commit adds the missing imports and resolves the issue.

- Import `run` from the appropriate module.
- Import `path` to resolve file paths.

The script should now run without errors.

PR-URL: nodejs#49489
Fixes: nodejs#49488
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

Author: OshriAsulin

doc/api/test.md

@@ -908,7 +908,9 @@ changes:
 
 ```mjs
 import { tap } from 'node:test/reporters';
+import { run } from 'node:test';
 import process from 'node:process';
+import path from 'node:path';
 
 run({ files: [path.resolve('./tests/test.js')] })
   .compose(tap)
@@ -917,6 +919,8 @@ run({ files: [path.resolve('./tests/test.js')] })
 
 ```cjs
 const { tap } = require('node:test/reporters');
+const { run } = require('node:test');
+const path = require('node:path');
 
 run({ files: [path.resolve('./tests/test.js')] })
   .compose(tap)