Actually update default payment method when set as default checkbox checked on manage PM screen

[amk-stripe]

Summary

Actually update default payment method when set as default checkbox checked on manage PM screen

Motivation

https://jira.corp.stripe.com/browse/MOBILESDK-2690

This PR sets the default PM in the backend. There's still a little more work to do here, because the other manage PM screens don't update their selection properly after the new default is set. I'm going to follow up with the remaining behavior changes to make this 💯

Testing

• Added tests
• Modified tests
• Manually verified

Screen recording

set.default.in.backend.webm

[amk-stripe]

I'm gonna follow up an add an unexpected error event here

[amk-stripe]

I'm gonna follow up an add an unexpected error event here -- this should never happen. We should always update either the card brand or the default PM

[amk-stripe]

the error messages here aren't finalized -- I've scheduled some time with JJ to figure out how we should handle these error states, but I'm just trying to merge something reasonable until then!

[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 MiB │     1 MiB │  0 B │     1 MiB │     1 MiB │  0 B 
 manifest │   2.3 KiB │   2.3 KiB │  0 B │     8 KiB │     8 KiB │  0 B 
      res │ 302.6 KiB │ 302.6 KiB │  0 B │ 456.7 KiB │ 456.7 KiB │  0 B 
   native │   6.2 MiB │   6.2 MiB │  0 B │  15.8 MiB │  15.8 MiB │  0 B 
    asset │   7.3 KiB │   7.3 KiB │  0 B │   7.1 KiB │   7.1 KiB │  0 B 
    other │  95.1 KiB │  95.1 KiB │ -3 B │ 182.2 KiB │ 182.2 KiB │  0 B 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
    total │   9.6 MiB │   9.6 MiB │ -3 B │  21.6 MiB │  21.6 MiB │  0 B 

 DEX     │ old   │ new   │ diff      
─────────┼───────┼───────┼───────────
   files │     1 │     1 │ 0         
 strings │ 20102 │ 20102 │ 0 (+0 -0) 
   types │  6216 │  6216 │ 0 (+0 -0) 
 classes │  5011 │  5011 │ 0 (+0 -0) 
 methods │ 29963 │ 29963 │ 0 (+0 -0) 
  fields │ 17341 │ 17341 │ 0 (+0 -0) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  164 │  164 │  0   
 entries │ 3643 │ 3643 │  0

APK

   compressed    │   uncompressed   │                        
──────────┬──────┼───────────┬──────┤                        
 size     │ diff │ size      │ diff │ path                   
──────────┼──────┼───────────┼──────┼────────────────────────
 28.9 KiB │ -6 B │    64 KiB │  0 B │ ∆ META-INF/CERT.SF     
 25.7 KiB │ +2 B │  63.9 KiB │  0 B │ ∆ META-INF/MANIFEST.MF 
  1.2 KiB │ +1 B │   1.2 KiB │  0 B │ ∆ META-INF/CERT.RSA    
──────────┼──────┼───────────┼──────┼────────────────────────
 55.7 KiB │ -3 B │ 129.1 KiB │  0 B │ (total)