[Cookies Chapter 2024] Use newly exposed WPT_COOKIES in cookies.js

[yohhaan]

Modification of the custom metric cookies.js to use the newly exposed WPT_COOKIES which allows to directly access all cookies: 1st and 3rd parties, set through JS or HTTP.

This pull request documents the properties we would need for the cookies chapter for the Almanac 2024. See also my comment here on pull request 116

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Test websites:

• https://example.com/
• https://web.dev/

[github-actions[bot]]

Custom metrics for https://almanac.httparchive.org/en/2022/

WPT test run results: http://webpagetest.httparchive.org/results.php?test=240603_YY_D

Custom metrics for https://example.com/

WPT test run results: http://webpagetest.httparchive.org/results.php?test=240603_TJ_E Changed custom metrics values: ```json { "_cookies": [] } ```

Custom metrics for https://web.dev/

WPT test run results: http://webpagetest.httparchive.org/results.php?test=240603_10_F Changed custom metrics values: ```json { "_cookies": [ { "name": "_ga_devsite", "domain": "web.dev", "path": "/", "expires": 1752000013.767326, "size": 38, "httpOnly": false, "secure": false, "session": false, "sameParty": false }, { "name": "cookies_accepted", "domain": "web.dev", "path": "/", "expires": 1751136004, "size": 20, "httpOnly": false, "secure": false, "session": false, "sameParty": false }, { "name": "django_language", "domain": "web.dev", "path": "/", "expires": 1732992004, "size": 17, "httpOnly": false, "secure": false, "session": false, "sameParty": false }, { "name": "_ga_18JR3Q8PJ8", "domain": ".web.dev", "path": "/", "expires": 1752000005.889539, "size": 51, "httpOnly": false, "secure": false, "session": false, "sameParty": false }, { "name": "_ga", "domain": ".web.dev", "path": "/", "expires": 1752000005.890446, "size": 30, "httpOnly": false, "secure": false, "session": false, "sameParty": false } ] } ```

[yohhaan]

Documentation: https://chromedevtools.github.io/devtools-protocol/tot/Network/#type-Cookie

[nrllh]

@nrllh LGTY?

yes, it seems good.