feat: Capture volunteers from the registration system

[rpcross]

No description provided.

[richsalz]

A comment explaining this if statement would be helpful.

[rpcross]

Added comment

[rjsparks]

That's true for the summer meeting too (the nomcom selection process is run by then usually).

Instead I think we should discuss when the registration system should offer volunteering for nomcom - it may only want to do so only for the spring meeting. Or only if there is a nomcom configured that is accepting volunteers (and we can make the assumption that there would never be two nomcoms accepting volunteers at the same time.).

[jennifer-richards]

See inline - I want to confirm that it's ok to have bogus timestamps on existing Volunteer records and that the "time" field changing if the record is updated is what the field is meant to represent.

[jennifer-richards]

Tests failing - migrations need an update

The base branch was changed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e211dc5) 88.80% compared to head (0f28936) 88.80%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6605   +/-   ##
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  Coverage   88.80%   88.80%           
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  Files         285      285           
  Lines       40280    40291   +11     
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+ Hits        35771    35782   +11     
  Misses       4509     4509           

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