Create new Enrollment error state for users already enrolled, not expired yet / not within re-enrollment window

[thekaveman]

Also depends on what we decide to do with #1938

Need more information

We currently understand that the endpoint to get funding sources currently linked to a group will include the expiration date as well as funding source ID, e.g. something like:

{
  "list": [{
    "id": "2009b586-9c53-43c6-b274-5615adb856ee",
    "expiration": "2025-01-01T00:00:00Z"
  }],
  "total_count": "10"
}

• Confirm this is the endpoint to use to get back expiration date information
• Confirm response structure

Acceptance criteria

• Displayed for users that attempt to enroll while already being enrolled, but before their expiry_date (from Include expiry_date with all CalFresh / Low income enrollments #1877)
• Displayed for users that attempt to enroll while already being enrolled, but before the re-enrollment window: expiry_date - 2 weeks
• Dates are formatted and displayed correctly according to the user's chosen language
• Return Home button takes users back to the app home page / agency index page

[thekaveman]

Blocked by cal-itp/littlepay#28

[thekaveman]

Blocked by cal-itp/littlepay#53 and the related work around getting the expiry logic to work properly in #2062

[thekaveman]

See notes on #2032 (comment) for more context on the wider set of enrollment error pages.