[#3688] Add migration to set required fields from global configuration

[Viicos]

Part of #3688

For misconfigured backends (the ones without a URL and version and when no global default is configured), should we add an upgrade check?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6310a31) 96.34% compared to head (cc7b164) 96.34%.
Report is 6 commits behind head on master.

Additional details and impacted files

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##           master    #3870   +/-   ##
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  Coverage   96.34%   96.34%           
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  Files         707      707           
  Lines       22188    22188           
  Branches     2547     2547           
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  Hits        21378    21378           
  Misses        565      565           
  Partials      245      245           

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[sergei-maertens]

For misconfigured backends (the ones without a URL and version and when no global default is configured), should we add an upgrade check?

I don't think this makes a lot of sense - if in $current version registration configuration is broken, you don't really win anything by preventing an upgrade. It'll just stay broken, and they'll be forced to pick an object type next time they edit the form.