Adds autocomplete attribute to login username field

[knolleary]

Adds autocomplete="username" to the login field.

This required adding support for autocomplete as a property of ff-text-input.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.79%. Comparing base (0b4c35f) to head (d327dfa).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4774   +/-   ##
=======================================
  Coverage   78.79%   78.79%           
=======================================
  Files         311      311           
  Lines       14782    14782           
  Branches     3385     3385           
=======================================
  Hits        11647    11647           
  Misses       3135     3135           

Flag	Coverage Δ
backend	78.79% <ø> (ø)

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