Throw on get saved payment methods failure in test mode PaymentSheet

[amk-stripe]

Summary

Throw when getting saved payment methods fails while loading PaymentSheet in test mode

Motivation

To match behavior with iOS.

A developer recently realized they were using the incorrect ephemeralKeySecret in their Android SDK only when they started doing the same thing in iOS -- the iOS SDK threw an error, alerting them to their mistake, but the Android SDK silently failed.

Testing

• Added tests
• Modified tests
• Manually verified

There are already automated tests which cover the cases in which getting saved payment methods fails in CustomerRepositoryTest.kt.

Screen recording

Before	After
silently fails when saved payment methods fails.webm	payment fails when getting saved payment methods fails.webm

Changelog

• [Changed] In test mode, payments will fail when getting saved payment methods fails.

[github-actions]

Diffuse output:

OLD: identity-example-release-base.apk (signature: V1, V2)
NEW: identity-example-release-pr.apk (signature: V1, V2)

          │          compressed          │         uncompressed         
          ├───────────┬───────────┬──────┼───────────┬───────────┬──────
 APK      │ old       │ new       │ diff │ old       │ new       │ diff 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
      dex │     2 MiB │     2 MiB │  0 B │   4.1 MiB │   4.1 MiB │  0 B 
     arsc │   1.4 MiB │   1.4 MiB │  0 B │   1.4 MiB │   1.4 MiB │  0 B 
 manifest │   2.3 KiB │   2.3 KiB │  0 B │   8.1 KiB │   8.1 KiB │  0 B 
      res │ 363.2 KiB │ 363.2 KiB │  0 B │ 490.6 KiB │ 490.6 KiB │  0 B 
   native │   6.2 MiB │   6.2 MiB │  0 B │  15.8 MiB │  15.8 MiB │  0 B 
    asset │  67.8 KiB │  67.8 KiB │  0 B │  87.7 KiB │  87.7 KiB │  0 B 
    other │ 114.7 KiB │ 114.7 KiB │  0 B │ 270.3 KiB │ 270.3 KiB │  0 B 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
    total │  10.2 MiB │  10.2 MiB │  0 B │  22.2 MiB │  22.2 MiB │  0 B 

 DEX     │ old   │ new   │ diff      
─────────┼───────┼───────┼───────────
   files │     1 │     1 │ 0         
 strings │ 20963 │ 20963 │ 0 (+0 -0) 
   types │  6509 │  6509 │ 0 (+0 -0) 
 classes │  5298 │  5298 │ 0 (+0 -0) 
 methods │ 30646 │ 30646 │ 0 (+0 -0) 
  fields │ 17817 │ 17817 │ 0 (+0 -0) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  262 │  262 │  0   
 entries │ 5504 │ 5504 │  0