Remove instantDebitsBillingDetails feature flag

[tillh-stripe]

Summary

Motivation

Testing

• Added tests
• Modified tests
• Manually verified

Screenshots

Before	After
before screenshot	after screenshot

Changelog

[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 │   3.8 MiB │   3.8 MiB │ +335 B │   8.4 MiB │   8.4 MiB │ +380 B 
     arsc │   2.3 MiB │   2.3 MiB │    0 B │   2.3 MiB │   2.3 MiB │    0 B 
 manifest │     5 KiB │     5 KiB │    0 B │  24.7 KiB │  24.7 KiB │    0 B 
      res │ 902.2 KiB │ 902.2 KiB │    0 B │   1.4 MiB │   1.4 MiB │    0 B 
   native │   2.6 MiB │   2.6 MiB │    0 B │     6 MiB │     6 MiB │    0 B 
    asset │   1.6 MiB │   1.6 MiB │   +1 B │   1.6 MiB │   1.6 MiB │   +1 B 
    other │ 199.8 KiB │ 199.8 KiB │   +3 B │ 440.1 KiB │ 440.1 KiB │    0 B 
──────────┼───────────┼───────────┼────────┼───────────┼───────────┼────────
    total │  11.4 MiB │  11.4 MiB │ +339 B │  20.2 MiB │  20.2 MiB │ +381 B 

 DEX     │ old   │ new   │ diff         
─────────┼───────┼───────┼──────────────
   files │     1 │     1 │  0           
 strings │ 39724 │ 39724 │  0 (+1 -1)   
   types │ 13693 │ 13693 │  0 (+0 -0)   
 classes │ 11389 │ 11389 │  0 (+0 -0)   
 methods │ 58463 │ 58463 │  0 (+0 -0)   
  fields │ 38832 │ 38836 │ +4 (+23 -19) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  242 │  242 │  0   
 entries │ 6188 │ 6188 │  0

APK

    compressed     │    uncompressed    │                                           
──────────┬────────┼───────────┬────────┤                                           
 size     │ diff   │ size      │ diff   │ path                                      
──────────┼────────┼───────────┼────────┼───────────────────────────────────────────
  3.8 MiB │ +335 B │   8.4 MiB │ +380 B │ ∆ classes.dex                             
   53 KiB │  +10 B │ 117.6 KiB │    0 B │ ∆ META-INF/CERT.SF                        
 49.7 KiB │   -8 B │ 117.5 KiB │    0 B │ ∆ META-INF/MANIFEST.MF                    
    272 B │   +3 B │     120 B │    0 B │ ∆ META-INF/version-control-info.textproto 
  1.2 KiB │   -2 B │   1.2 KiB │    0 B │ ∆ META-INF/CERT.RSA                       
  7.8 KiB │   +1 B │   7.7 KiB │   +1 B │ ∆ assets/dexopt/baseline.prof             
──────────┼────────┼───────────┼────────┼───────────────────────────────────────────
  3.9 MiB │ +339 B │   8.6 MiB │ +381 B │ (total)

DEX

STRINGS:

   old   │ new   │ diff      
  ───────┼───────┼───────────
   39724 │ 39724 │ 0 (+1 -1) 
  
  + ~~R8{"backend":"dex","compilation-mode":"release","has-checksums":false,"min-api":21,"pg-map-id":"e005f7d","r8-mode":"full","version":"8.7.14"}
  
  - ~~R8{"backend":"dex","compilation-mode":"release","has-checksums":false,"min-api":21,"pg-map-id":"17ba877","r8-mode":"full","version":"8.7.14"}
  

FIELDS:

   old   │ new   │ diff         
  ───────┼───────┼──────────────
   38832 │ 38836 │ +4 (+23 -19) 
  
  + z7.C A: O
  + z7.C B: r1
  + z7.C C: d0
  + z7.C D: d0
  + z7.C E: d0
  + z7.C F: d
  + z7.C G: g
  + z7.C j: boolean
  + z7.C k: boolean
  + z7.C l: boolean
  + z7.C m: boolean
  + z7.C n: v1
  + z7.C p: v1
  + z7.C q: d
  + z7.C r: B0
  + z7.C s: d
  + z7.C t: c1
  + z7.C u: i
  + z7.C v: b0
  + z7.C w: b0
  + z7.C x: O
  + z7.C y: O
  + z7.C z: O
  
  - z7.C A: d0
  - z7.C B: d
  - z7.C C: g
  - z7.C j: v1
  - z7.C k: d
  - z7.C l: v1
  - z7.C m: d
  - z7.C n: B0
  - z7.C p: c1
  - z7.C q: i
  - z7.C r: b0
  - z7.C s: b0
  - z7.C t: O
  - z7.C u: O
  - z7.C v: O
  - z7.C w: O
  - z7.C x: r1
  - z7.C y: d0
  - z7.C z: d0