feat: Add email to checkout request body and remove from header

[seer-by-sentry]

Fixes ANDROID-51. The issue was that: Flask checkout function raises KeyError accessing order["email"] because the Android request payload lacks the "email" field.

• Moves the email from the header to the request body for the checkout request.
• Removes the email header from the checkout request.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 210427

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (10214e0) to head (eab0858).

Files with missing lines	Patch %	Lines
.../example/vu/android/empowerplant/MainFragment.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #183   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         16      16           
  Lines        898     898           
  Branches      65      65           
=====================================
  Misses       898     898           

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