fix(network): Include subdomains of localhost when including cookies

[simenbrekken]

Replaced the direct check for parsedURL.hostname === 'localhost' with a new helper function isLocalHostname, which also considers hostnames ending with .localhost as local. This improves flexibility and correctness when handling local hostnames.

See also RFC 6761 section 6.3 on handling of localhost.

[yury-s]

The change looks good, but please add a test. Also would be nice to have an issue which describes the problem the PR is fixing.

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[simenbrekken]

@yury-s I added a failing test but I couldn't figure out why it's failing, any ideas?

[github-actions]

Test results for "tests 1"

6 failed
❌ [chromium-library] › library/global-fetch-cookie.spec.ts:143:1 › should send secure cookie over http for subdomains of localhost @chromium-ubuntu-22.04-node18
❌ [chromium-library] › library/global-fetch-cookie.spec.ts:143:1 › should send secure cookie over http for subdomains of localhost @chromium-ubuntu-22.04-node20
❌ [chromium-library] › library/global-fetch-cookie.spec.ts:143:1 › should send secure cookie over http for subdomains of localhost @chromium-ubuntu-22.04-node22
❌ [firefox-library] › library/global-fetch-cookie.spec.ts:143:1 › should send secure cookie over http for subdomains of localhost @firefox-ubuntu-22.04-node18
❌ [chromium-library] › library/global-fetch-cookie.spec.ts:143:1 › should send secure cookie over http for subdomains of localhost @ubuntu-22.04-chromium-tip-of-tree
❌ [webkit-library] › library/global-fetch-cookie.spec.ts:143:1 › should send secure cookie over http for subdomains of localhost @webkit-ubuntu-22.04-node18

4 flaky

⚠️ [firefox-page] › page/page-evaluate.spec.ts:424:3 › should throw for too deep reference chain @firefox-ubuntu-22.04-node18
⚠️ [webkit-library] › library/trace-viewer.spec.ts:1309:1 › should pick locator in iframe @webkit-ubuntu-22.04-node18
⚠️ [playwright-test] › ui-mode-test-output.spec.ts:80:5 › should show console messages for test @windows-latest-node18-1
⚠️ [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all @windows-latest-node18-1

39103 passed, 809 skipped
✔️✔️✔️

Merge workflow run.

[yury-s]

The new test is failing across platforms, please fix.

[yury-s]

Suggested change

	await request.get(`${`http://a.b.localhost:${server.PORT}`}/setcookie.html`);
	await request.get(`http://a.b.localhost:${server.PORT}/setcookie.html`);