Fix issue with "Change email" behavior in Link

[tillh-stripe]

Summary

This pull request fixes an issue with the “Change email” behavior in Link.

After selecting “Change email” and closing the flow, we now show the signup screen on re-open instead of the verification screen. This makes more sense, since the user already indicated that they don't want to use the email address that we pull from the CustomerInfo object.

Motivation

LINK_MOBILE-165

Testing

• Added tests
• Modified tests
• Manually verified

Screen recordings

Before

Screen_recording_20250423_113043.mp4

After

Screen_recording_20250423_112842.mp4

Changelog

[tillh-stripe]

I was thinking of only setting the email address to null and keeping the other values as-is, but Web seems to fully clear the customer info for the same flow.

[tillh-stripe]

Might be weird that this happens here, but if we don't update the configuration, then this code will fetch the Link account associated with that email address.

[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 │   2.1 MiB │   2.1 MiB │  0 B │   4.3 MiB │   4.3 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 │ 302.9 KiB │ 302.9 KiB │  0 B │   457 KiB │   457 KiB │  0 B 
   native │   6.2 MiB │   6.2 MiB │  0 B │  15.8 MiB │  15.8 MiB │  0 B 
    asset │   7.7 KiB │   7.7 KiB │  0 B │   7.4 KiB │   7.4 KiB │  0 B 
    other │  95.7 KiB │  95.7 KiB │ +5 B │ 183.5 KiB │ 183.5 KiB │  0 B 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
    total │   9.8 MiB │   9.8 MiB │ +5 B │  21.8 MiB │  21.8 MiB │  0 B 

 DEX     │ old   │ new   │ diff      
─────────┼───────┼───────┼───────────
   files │     1 │     1 │ 0         
 strings │ 20668 │ 20668 │ 0 (+0 -0) 
   types │  6493 │  6493 │ 0 (+0 -0) 
 classes │  5259 │  5259 │ 0 (+0 -0) 
 methods │ 31489 │ 31489 │ 0 (+0 -0) 
  fields │ 18221 │ 18221 │ 0 (+0 -0) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  164 │  164 │  0   
 entries │ 3646 │ 3646 │  0

APK

   compressed    │   uncompressed   │                        
──────────┬──────┼───────────┬──────┤                        
 size     │ diff │ size      │ diff │ path                   
──────────┼──────┼───────────┼──────┼────────────────────────
 29.2 KiB │ +4 B │  64.6 KiB │  0 B │ ∆ META-INF/CERT.SF     
  1.2 KiB │ +2 B │   1.2 KiB │  0 B │ ∆ META-INF/CERT.RSA    
 25.9 KiB │ -1 B │  64.5 KiB │  0 B │ ∆ META-INF/MANIFEST.MF 
──────────┼──────┼───────────┼──────┼────────────────────────
 56.2 KiB │ +5 B │ 130.4 KiB │  0 B │ (total)

[carlosmuvi-stripe]

LGTM! one small comment

[carlosmuvi-stripe]

nit - I think this is more understandable as an extension function of LinkConfiguration, so that it reads:

args.configuration.withUpdatedCustomerInfo(args.LinkAccount) - might be a bit more verbose on the other hand so leave it as is if it makes sense!