feat: Add custom metric for UCP well-known file parsing

[tsunoyu]

Description

This PR adds support for tracking and analyzing a critical file related to the Universal Commerce Protocol (UCP):

1. UCP Profile: /.well-known/ucp

This file is central to the Universal Commerce Protocol (UCP) and allows businesses to publish their accepted payment handlers and available services to agents. The changes ensure this file is fetched, parsed, and included in the HTTP Archive's custom metrics for analysis of this standard's adoption.

Changes

1. Added a new parseResponse call for /.well-known/ucp to track its presence and extract key metadata cleanly without overloading the payload, such as the UCP profile version, whether payment handlers exist, and the signing keys count.

Example Output

UCP Profile (/.well-known/ucp)

{
  "/.well-known/ucp": {
    "found": true,
    "data": {
      "has_ucp": true,
      "version": "2026-01-11",
      "has_payment_handlers": true,
      "signing_keys_count": 0
    }
  }
}

---

Test websites:

• https://business-store.dev/
• https://www.mozilla.org/

[tsunoyu]

I can see that the test captured the new UCP logic.

"/.well-known/ucp": {
      "found": true,
      "data": {
        "has_ucp": true,
        "version": "2026-01-11",
        "has_payment_handlers": true,
        "signing_keys_count": 0
      }

[tunetheweb]

LGTM with a couple of minor nits

[github-actions]

https://almanac.httparchive.org/en/2022/

WPT result details

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}

https://business-store.dev

WPT result details

Changed custom metrics values:

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          "noindex": 0,
          "other": 0
        }
      }
    }
  },
  "_third-parties": [
    {
      "name": "Workbox",
      "version": null
    }
  ],
  "_well-known": {
    "/.well-known/assetlinks.json": {
      "found": false
    },
    "/.well-known/apple-app-site-association": {
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    },
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    "/.well-known/privacy-sandbox-attestations.json": {
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    },
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    },
    "/.well-known/web-identity": {
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    },
    "/.well-known/passkey-endpoints": {
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    },
    "/.well-known/webauthn": {
      "found": false
    },
    "/.well-known/ucp": {
      "found": true,
      "data": {
        "has_ucp": true,
        "version": "2026-01-11",
        "has_payment_handlers": true,
        "signing_keys_count": 0
      }
    },
    "/robots.txt": {
      "found": true,
      "data": {
        "matched_disallows": {}
      }
    },
    "/.well-known/security.txt": {
      "found": false,
      "data": {
        "status": 404,
        "redirected": false,
        "url": "https://business-store.dev/.well-known/security.txt",
        "content_type": "application/json"
      }
    },
    "/.well-known/change-password": {
      "found": false,
      "data": {
        "status": 404,
        "redirected": false,
        "url": "https://business-store.dev/.well-known/change-password"
      }
    },
    "/.well-known/resource-that-should-not-exist-whose-status-code-should-not-be-200/": {
      "found": false,
      "data": {
        "status": 404,
        "redirected": false,
        "url": "https://business-store.dev/.well-known/resource-that-should-not-exist-whose-status-code-should-not-be-200/"
      }
    }
  }
}

https://www.mozilla.org

WPT result details

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