Use locale in PopupPayload

[samer-stripe]

Summary

In PopupPayload, we currently use the customer's provided info to fetch their billing country. If the customer does not have a provided billing country, then we use the merchant's billing country.

There's a good chance the merchant and customer do not have the same billing country. Using the device's locale gives us a more accurate result of the customer's billing country.

Motivation

Resolves MOBILESDK-1852

iOS also uses the intent's billing country as a third backup but on Android we have a guaranteed locale returned.

Testing

• Added tests
• Modified tests
• Manually verified

[github-actions]

Diffuse output:

OLD: paymentsheet-example-release-master.apk (signature: V1, V2)
NEW: paymentsheet-example-release-pr.apk (signature: V1, V2)

          │          compressed           │        uncompressed         
          ├───────────┬───────────┬───────┼──────────┬──────────┬───────
 APK      │ old       │ new       │ diff  │ old      │ new      │ diff  
──────────┼───────────┼───────────┼───────┼──────────┼──────────┼───────
      dex │   3.9 MiB │   3.9 MiB │ +63 B │  8.6 MiB │  8.6 MiB │ +20 B 
     arsc │   2.5 MiB │   2.5 MiB │   0 B │  2.5 MiB │  2.5 MiB │   0 B 
 manifest │   5.1 KiB │   5.1 KiB │   0 B │ 25.4 KiB │ 25.4 KiB │   0 B 
      res │ 935.7 KiB │ 935.7 KiB │   0 B │  1.5 MiB │  1.5 MiB │   0 B 
   native │   2.6 MiB │   2.6 MiB │   0 B │    6 MiB │    6 MiB │   0 B 
    asset │     3 MiB │     3 MiB │ -17 B │    3 MiB │    3 MiB │ -17 B 
    other │ 210.8 KiB │ 210.8 KiB │  -4 B │  471 KiB │  471 KiB │   0 B 
──────────┼───────────┼───────────┼───────┼──────────┼──────────┼───────
    total │  13.1 MiB │  13.1 MiB │ +42 B │   22 MiB │   22 MiB │  +3 B 

 DEX     │ old   │ new   │ diff       
─────────┼───────┼───────┼────────────
   files │     1 │     1 │  0         
 strings │ 42710 │ 42710 │  0 (+1 -1) 
   types │ 14590 │ 14590 │  0 (+0 -0) 
 classes │ 12341 │ 12341 │  0 (+0 -0) 
 methods │ 61050 │ 61051 │ +1 (+1 -0) 
  fields │ 40046 │ 40046 │  0 (+0 -0) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  328 │  328 │  0   
 entries │ 7262 │ 7262 │  0

APK

    compressed    │   uncompressed    │                               
──────────┬───────┼───────────┬───────┤                               
 size     │ diff  │ size      │ diff  │ path                          
──────────┼───────┼───────────┼───────┼───────────────────────────────
  3.9 MiB │ +63 B │   8.6 MiB │ +20 B │ ∆ classes.dex                 
  7.2 KiB │ -17 B │     7 KiB │ -17 B │ ∆ assets/dexopt/baseline.prof 
 54.3 KiB │  -4 B │ 152.8 KiB │   0 B │ ∆ META-INF/MANIFEST.MF        
 67.8 KiB │  +2 B │ 152.9 KiB │   0 B │ ∆ META-INF/CERT.SF            
  1.2 KiB │  -2 B │   1.2 KiB │   0 B │ ∆ META-INF/CERT.RSA           
──────────┼───────┼───────────┼───────┼───────────────────────────────
    4 MiB │ +42 B │   8.9 MiB │  +3 B │ (total)

DEX

STRINGS:

   old   │ new   │ diff      
  ───────┼───────┼───────────
   42710 │ 42710 │ 0 (+1 -1) 
  
  + ~~R8{backend:dex,compilation-mode:release,has-checksums:false,min-api:21,pg-map-id:0b4bc0a,r8-mode:full,version:8.2.47}
  
  - ~~R8{backend:dex,compilation-mode:release,has-checksums:false,min-api:21,pg-map-id:8b7a685,r8-mode:full,version:8.2.47}
  

METHODS:

   old   │ new   │ diff       
  ───────┼───────┼────────────
   61050 │ 61051 │ +1 (+1 -0) 
  
  + ed.c a(p) → String

[amk-stripe]

😆

[amk-stripe]

this seems useful! Do we have test utils or anything like that? It'd be nice to have an easy way to find functions like this if I ever wanted to use one. Not necessary for this PR just an idea :)

[samer-stripe]

We could add a test util for this as part of the new testing module @tjclawson-stripe will be adding.