Remove ExperimentalPaymentSheetDecouplingApi.

[jaynewstrom-stripe]

Summary

Motivation

Testing

• Added tests
• Modified tests
• Manually verified

Screenshots

Before	After
before screenshot	after screenshot

Changelog

[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 │   1.1 MiB │   1.1 MiB │  0 B │   1.1 MiB │   1.1 MiB │  0 B 
 manifest │   2.3 KiB │   2.3 KiB │  0 B │     8 KiB │     8 KiB │  0 B 
      res │ 302.7 KiB │ 302.7 KiB │  0 B │ 456.5 KiB │ 456.5 KiB │  0 B 
   native │   7.9 MiB │   7.9 MiB │  0 B │  19.3 MiB │  19.3 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 │  11.5 MiB │  11.5 MiB │ +5 B │  25.4 MiB │  25.4 MiB │  0 B 

 DEX     │ old   │ new   │ diff      
─────────┼───────┼───────┼───────────
   files │     1 │     1 │ 0         
 strings │ 20710 │ 20710 │ 0 (+0 -0) 
   types │  6515 │  6515 │ 0 (+0 -0) 
 classes │  5279 │  5279 │ 0 (+0 -0) 
 methods │ 31555 │ 31555 │ 0 (+0 -0) 
  fields │ 18279 │ 18279 │ 0 (+0 -0) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  163 │  163 │  0   
 entries │ 3665 │ 3665 │  0

APK

   compressed    │   uncompressed   │                                           
──────────┬──────┼───────────┬──────┤                                           
 size     │ diff │ size      │ diff │ path                                      
──────────┼──────┼───────────┼──────┼───────────────────────────────────────────
 29.2 KiB │ +5 B │  64.6 KiB │  0 B │ ∆ META-INF/CERT.SF                        
  1.2 KiB │ -2 B │   1.2 KiB │  0 B │ ∆ META-INF/CERT.RSA                       
    272 B │ +1 B │     120 B │  0 B │ ∆ META-INF/version-control-info.textproto 
 25.9 KiB │ +1 B │  64.5 KiB │  0 B │ ∆ META-INF/MANIFEST.MF                    
──────────┼──────┼───────────┼──────┼───────────────────────────────────────────
 56.5 KiB │ +5 B │ 130.5 KiB │  0 B │ (total)

[cttsai-stripe]

Can we merge this PR now if it is unused?

[jaynewstrom-stripe]

It's a public class, we could merge it now based on our policy today, but we should just wait 1 day since we've already waited this long.