Use pre-defined choices for company types

[ivarnakken]

Can be used in filtering on /companies, and to auto-complete the interest form after a company has been selected (the company interest model already uses the same choices).

The text field is not optional in the frontend, so it has not been used that much. I will manually migrate these.

[linear]

ABA-1204 Use predefined company types in company model

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.60%. Comparing base (c52c6f1) to head (8f45904).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3702   +/-   ##
=======================================
  Coverage   89.60%   89.60%           
=======================================
  Files         700      701    +1     
  Lines       22430    22434    +4     
=======================================
+ Hits        20099    20103    +4     
  Misses       2331     2331           

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[norbye]

Nice!

[falbru]

LGTM