ECTO-2519 - improve IAP checkout subscription change UI (#137)

[Jannik (qysp)]

Backport to 6.6.x

[Codecov Comments Bot (codecov-commenter)]

Codecov Report

❌ Patch coverage is 85.18519% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.37%. Comparing base (31116fc) to head (b125cde).

Files with missing lines	Patch %	Lines
...nent/sw-in-app-purchase-checkout-overview/index.ts	0.00%	3 Missing ⚠️
...app-purchase-checkout-subscription-change/index.ts	95.83%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##              6.6.x     #141      +/-   ##
============================================
- Coverage     69.47%   67.37%   -2.10%     
============================================
  Files            37       29       -8     
  Lines          1163      846     -317     
  Branches        155      162       +7     
============================================
- Hits            808      570     -238     
+ Misses          325      247      -78     
+ Partials         30       29       -1     

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