feat: add email to the stripe customer serializer

[adrian-codecov]

Purpose/Motivation

Forgot to add this when making the API ticket to change the billing email from the client

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[codecov-staging]

Codecov Report

All modified and coverable lines are covered by tests ✅

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[codecov-qa]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3a8f1ae) 96.08% compared to head (ab31b9c) 96.08%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #363   +/-   ##
=======================================
  Coverage   96.08%   96.08%           
=======================================
  Files         632      632           
  Lines       16409    16410    +1     
=======================================
+ Hits        15766    15767    +1     
  Misses        643      643           

Flag	Coverage Δ
unit	96.08% <100.00%> (+<0.01%)	⬆️
unit-latest-uploader	96.08% <100.00%> (+<0.01%)	⬆️

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[codecov-public-qa]

Codecov Report

Merging #363 (ab31b9c) into main (3a8f1ae) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #363   +/-   ##
=======================================
  Coverage   96.08%   96.08%           
=======================================
  Files         632      632           
  Lines       16409    16410    +1     
=======================================
+ Hits        15766    15767    +1     
  Misses        643      643           

Flag	Coverage Δ
unit	96.08% <100.00%> (+<0.01%)	⬆️
unit-latest-uploader	96.08% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
api/internal/owner/serializers.py	99.01% <100.00%> (+<0.01%)	⬆️

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3a8f1ae) 95.75% compared to head (ab31b9c) 95.75%.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #363   +/-   ##
=====================================
  Coverage   95.75   95.75           
=====================================
  Files        747     747           
  Lines      16927   16928    +1     
=====================================
+ Hits       16208   16209    +1     
  Misses       719     719           

Flag	Coverage Δ
unit	96.08% <100.00%> (+<0.01%)	⬆️
unit-latest-uploader	96.08% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

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