chore(deps-dev): Bump @playwright/test from 1.38.1 to 1.39.0 in /core (#28339)

Bumps [@playwright/test](https://github.com/microsoft/playwright) from
1.38.1 to 1.39.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/microsoft/playwright/releases"><code>@​playwright/test</code>'s
releases</a>.</em></p>
<blockquote>
<h2>v1.39.0</h2>
<h2>Add custom matchers to your expect</h2>
<p>You can extend Playwright assertions by providing custom matchers.
These matchers will be available on the expect object.</p>
<pre lang="js"><code>import { expect as baseExpect } from
'@playwright/test';
export const expect = baseExpect.extend({
async toHaveAmount(locator: Locator, expected: number, options?: {
timeout?: number }) {
    // ... see documentation for how to write matchers.
  },
});
<p>test('pass', async ({ page }) =&gt; {
await expect(page.getByTestId('cart')).toHaveAmount(5);
});
</code></pre></p>
<p>See the documentation <a
href="https://playwright.dev/docs/test-configuration#add-custom-matchers-using-expectextend">for
a full example</a>.</p>
<h2>Merge test fixtures</h2>
<p>You can now merge test fixtures from multiple files or modules:</p>
<pre lang="js"><code>import { mergeTests } from '@playwright/test';
import { test as dbTest } from 'database-test-utils';
import { test as a11yTest } from 'a11y-test-utils';
<p>export const test = mergeTests(dbTest, a11yTest);
</code></pre></p>
<pre lang="js"><code>import { test } from './fixtures';

test('passes', async ({ database, page, a11y }) =&gt; {
  // use database and a11y fixtures.
});
</code></pre>
<h2>Merge custom expect matchers</h2>
<p>You can now merge custom expect matchers from multiple files or
modules:</p>
<pre lang="js"><code>import { mergeTests, mergeExpects } from
'@playwright/test';
import { test as dbTest, expect as dbExpect } from
'database-test-utils';
import { test as a11yTest, expect as a11yExpect } from
'a11y-test-utils';
<p>export const test = mergeTests(dbTest, a11yTest);
&lt;/tr&gt;&lt;/table&gt;
</code></pre></p>
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/playwright/commit/3049d99bc8c76799817585a359502368bd6ba366"><code>3049d99</code></a>
cherry-pick(<a
href="https://redirect.github.com/microsoft/playwright/issues/27555">#27555</a>):
chore: composed-&gt;merge</li>
<li><a
href="https://github.com/microsoft/playwright/commit/ae31f58b438a77c89dbbf940eabf3bdb3e5f0e2d"><code>ae31f58</code></a>
chore: mark 1.39.0 (<a
href="https://redirect.github.com/microsoft/playwright/issues/27550">#27550</a>)</li>
<li><a
href="https://github.com/microsoft/playwright/commit/5313514995e775f8c916914daf8e7cd37d6614fd"><code>5313514</code></a>
cherry-pick(<a
href="https://redirect.github.com/microsoft/playwright/issues/27549">#27549</a>):
docs: update release notes for 1.39</li>
<li><a
href="https://github.com/microsoft/playwright/commit/0d168dc8d0ea3a3b14e27833b3187459c121ba46"><code>0d168dc</code></a>
chore: release notes for 1.39 (<a
href="https://redirect.github.com/microsoft/playwright/issues/27537">#27537</a>)</li>
<li><a
href="https://github.com/microsoft/playwright/commit/4f9b285c07455bcb8101b24d59e00f373242d5b1"><code>4f9b285</code></a>
chore: update WebKit version to 17.4 (<a
href="https://redirect.github.com/microsoft/playwright/issues/27536">#27536</a>)</li>
<li><a
href="https://github.com/microsoft/playwright/commit/d11380e9119799ecdec9b2377c81deca98aa8a23"><code>d11380e</code></a>
docs: improve test.step documentation (<a
href="https://redirect.github.com/microsoft/playwright/issues/27535">#27535</a>)</li>
<li><a
href="https://github.com/microsoft/playwright/commit/9edb811434d1f77a5017d5ff2d4c22f782e097c4"><code>9edb811</code></a>
feat(chromium-tip-of-tree): roll to r1158 (<a
href="https://redirect.github.com/microsoft/playwright/issues/27533">#27533</a>)</li>
<li><a
href="https://github.com/microsoft/playwright/commit/d05c86538932237d5536c2769729a9db2e0bfd23"><code>d05c865</code></a>
test: unflake a few tests (<a
href="https://redirect.github.com/microsoft/playwright/issues/27519">#27519</a>)</li>
<li><a
href="https://github.com/microsoft/playwright/commit/2776d8446bc81ac7cf62bcb0829ec99df802395c"><code>2776d84</code></a>
docs: how to update playwright in python (<a
href="https://redirect.github.com/microsoft/playwright/issues/27527">#27527</a>)</li>
<li><a
href="https://github.com/microsoft/playwright/commit/2407041090c5e662c33e6a0d66334f2906818cad"><code>2407041</code></a>
fix(chromium): avoid premature continue of redirects (<a
href="https://redirect.github.com/microsoft/playwright/issues/27520">#27520</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/microsoft/playwright/compare/v1.38.1...v1.39.0">compare
view</a></li>
</ul>
</details>
<br />


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