feat: Separate required and optional attendee fields

[iamareebjamal]

Fixes #4606

[vercel]

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[codecov]

Codecov Report

Merging #4916 into development will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##           development    #4916      +/-   ##
===============================================
- Coverage        23.17%   23.16%   -0.01%     
===============================================
  Files              481      481              
  Lines             5096     5098       +2     
  Branches            18       18              
===============================================
  Hits              1181     1181              
- Misses            3911     3913       +2     
  Partials             4        4              

Impacted Files	Coverage Δ
app/components/forms/wizard/attendee-step.js	0.00% <0.00%> (ø)

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