fix: restore versioned list payments and recurring payments

[tessstoddard]

Summary of Changes

Restore list version endpoints for recurring payments and payments. I had to add a cast to the return value so that the xml serializer understands that it is a MdxList or MdxList

Fixes # https://mxcom.atlassian.net/browse/GCU-1345

Public API Additions/Changes

Adds a versioned endpoint for list payment and recurring payment

Downstream Consumer Impact

None. Services that currently have this feature should be getting the default behavior

How Has This Been Tested?

Unit tests and pulled this in locally to verify that response is correct for default methods

= Request

GET http://localhost:3009/globalcu/users/U-00u3la36x0bbNvPud1d7/recurring_payments

mx-feature: payments
cookie: JSESSIONID=904854845A6123A5D49269722C804483
host: localhost:3009
mx-session-key: **MASKED**
accept-encoding: br, deflate, gzip, x-gzip
accept: application/vnd.mx.mdx.v6+json
user-agent: IntelliJ HTTP Client/IntelliJ IDEA 2026.1.3

= Response

200
Content-Type: application/vnd.mx.mdx.v6+json;charset=UTF-8
{
  "recurring_payments": [
    {
      "id": "**MASKED**",
      "confirmation_id": "96495149",
      "account_id": "**MASKED**",
      "payee_id": "155353959",
      "payee_name": "John 18711736",
      "frequency_id": "DEFAULT",
      "status": "ACTIVE",
      "amount": 7.04,
      "memo": "**MASKED**",
      "end_after_count": 1,
      "payments_count": 0,
      "next_payment_on": "2078-01-09",
      "user_id": "U-00u3la36x0bbNvPud1d7"
    }
  ]
}

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works