Revert "Allow user authentication via SFTP token"

[liam-lloyd]

Reverts #772

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.56%. Comparing base (12f7301) to head (2103bf5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #787   +/-   ##
=======================================
  Coverage   98.56%   98.56%           
=======================================
  Files         109      109           
  Lines        2778     2780    +2     
  Branches      464      465    +1     
=======================================
+ Hits         2738     2740    +2     
  Misses         36       36           
  Partials        4        4           

Flag	Coverage Δ
api	98.56% <ø> (+<0.01%)	⬆️

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