fix: signup mutation data population error

[meetulr]

What kind of change does this PR introduce?

Modifies sign-up mutation to populate user schema fields.

Issue Number:

Fixes #2203

Did you add tests for your changes?

Yes

Snapshot

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.82%. Comparing base (65069df) to head (f6c685c).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2205      +/-   ##
===========================================
+ Coverage    98.50%   98.82%   +0.31%     
===========================================
  Files          340      340              
  Lines        22873    24563    +1690     
  Branches      2020     2296     +276     
===========================================
+ Hits         22532    24275    +1743     
+ Misses         338      285      -53     
  Partials         3        3              

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