feat: plenary attendance by email address API

[jennifer-richards]

Adds an API that looks up plenary meeting attendance for a person by email address. Uses any email address (including inactive). Only returns data for meeting 110 onward, where we have modern attendance data. The filtering is intended to agree with the current attendance calculations - if it does not, that is a bug.

Will return attendance type as "onsite" or "remote". Only "student", "week_pass", "one_day", or "unknown" ticket types are returned. I believe these are the only combinations that reflect plenary registration / attendance.

Refactors the Registration.attendance_type property to work with bulk operations. Adds tests.

Eliminates per-row queries in the proceedings_attendees() view, dropping it from ~ 2000 to 2.

A few cases where one person has multiple Registrations for a single meeting exist. These are represented as multiple entries with the same "meeting" value in the returned list. I.e., each individual Registration is resolved to a single attendance type / ticket type, but no attempt to reconcile multiple Registration records for a single meeting.

Output looks like:

{
  "attended": [
    {
      "meeting": "110",
      "attendance_type": "remote",
      "ticket_type": "unknown"
    },
    {
      "meeting": "111",
      "attendance_type": "remote",
      "ticket_type": "week_pass"
    },
    {
      "meeting": "112",
      "attendance_type": "remote",
      "ticket_type": "unknown"
    },
    {
      "meeting": "113",
      "attendance_type": "remote",
      "ticket_type": "week_pass"
    },
    {
      "meeting": "114",
      "attendance_type": "remote",
      "ticket_type": "week_pass"
    }
  ]
}

[jennifer-richards]

Needs a test of the new api url (that's the cause of the test failure)

Tests added

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.73%. Comparing base (22c808c) to head (86cc845).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11633      +/-   ##
==========================================
+ Coverage   88.65%   88.73%   +0.08%     
==========================================
  Files         333      337       +4     
  Lines       44966    45313     +347     
==========================================
+ Hits        39866    40210     +344     
- Misses       5100     5103       +3     

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