Remove unused SA fields

[OskarPersson]

No description provided.

[codecov]

Codecov Report

Merging #329 into master will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #329      +/-   ##
==========================================
- Coverage   54.77%   54.64%   -0.13%     
==========================================
  Files         160      160              
  Lines       11533    11501      -32     
  Branches     1493     1493              
==========================================
- Hits         6317     6285      -32     
  Misses       5024     5024              
  Partials      192      192

Flag	Coverage Δ
#backend	54.64% <ø> (-0.13%)	⬇️

Impacted Files	Coverage Δ
ESSArch_Core/profiles/models.py	73.09% <ø> (-3.76%)	⬇️
ESSArch_Core/profiles/admin.py	78.78% <ø> (ø)	⬆️
ESSArch_Core/profiles/serializers.py	72.72% <ø> (ø)	⬆️

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