fix: Race condition in subscription creation webhook handlers

[spalmurray-codecov]

Fixes weird bug in subscription creation webhook flow that caused customer's default payment method to not be set.

[codecov-notifications]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.25%. Comparing base (97f26ab) to head (b860cfd).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #959   +/-   ##
=======================================
  Coverage   96.25%   96.25%           
=======================================
  Files         826      826           
  Lines       19040    19043    +3     
=======================================
+ Hits        18326    18329    +3     
  Misses        714      714           

Flag	Coverage Δ
unit	92.50% <100.00%> (+<0.01%)	⬆️
unit-latest-uploader	92.50% <100.00%> (+<0.01%)	⬆️

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[ajay-sentry]

dank