Add elements/session analytics for CustomerSession on CustomerSheet

[samer-stripe]

Summary

Add elements/session analytics for CustomerSession on CustomerSheet

Motivation

Track success & failed loads for elements/session on CustomerSheet with CustomerSession.

Testing

• Added tests
• Modified tests
• Manually verified

[samer-stripe]

We expect that both of these are fired. We should indicate if elements/session was loaded successfully from the endpoint but the unexpected error indicates to us that the response is malformed.

The malformed response should never happen. We have client-side validation to ensure merchants aren't sending old ephemeral keys to elements/session and server-side validation should take care of the rest. If the customer field is not available. Something erroneous has occurred on the elements/session side.

[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 │ +113 B │   8.6 MiB │   8.6 MiB │ +492 B 
     arsc │   2.3 MiB │   2.3 MiB │    0 B │   2.3 MiB │   2.3 MiB │    0 B 
 manifest │   5.1 KiB │   5.1 KiB │    0 B │  25.9 KiB │  25.9 KiB │    0 B 
      res │ 933.6 KiB │ 933.6 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 │   2.9 MiB │   2.9 MiB │  -22 B │   2.9 MiB │   2.9 MiB │  -22 B 
    other │   196 KiB │   196 KiB │   +6 B │ 430.6 KiB │ 430.6 KiB │    0 B 
──────────┼───────────┼───────────┼────────┼───────────┼───────────┼────────
    total │  12.9 MiB │  12.9 MiB │  +97 B │  21.8 MiB │  21.8 MiB │ +470 B 

 DEX     │ old   │ new   │ diff       
─────────┼───────┼───────┼────────────
   files │     1 │     1 │  0         
 strings │ 42720 │ 42724 │ +4 (+5 -1) 
   types │ 14184 │ 14184 │  0 (+0 -0) 
 classes │ 11819 │ 11819 │  0 (+0 -0) 
 methods │ 60570 │ 60571 │ +1 (+3 -2) 
  fields │ 40170 │ 40171 │ +1 (+9 -8) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  242 │  242 │  0   
 entries │ 6253 │ 6253 │  0

APK

    compressed     │    uncompressed    │                               
──────────┬────────┼───────────┬────────┤                               
 size     │ diff   │ size      │ diff   │ path                          
──────────┼────────┼───────────┼────────┼───────────────────────────────
  3.9 MiB │ +113 B │   8.6 MiB │ +492 B │ ∆ classes.dex                 
  7.8 KiB │  -22 B │   7.7 KiB │  -22 B │ ∆ assets/dexopt/baseline.prof 
 53.4 KiB │   +7 B │ 118.3 KiB │    0 B │ ∆ META-INF/CERT.SF            
 50.1 KiB │   -1 B │ 118.2 KiB │    0 B │ ∆ META-INF/MANIFEST.MF        
──────────┼────────┼───────────┼────────┼───────────────────────────────
  4.1 MiB │  +97 B │   8.9 MiB │ +470 B │ (total)

DEX

STRINGS:

   old   │ new   │ diff       
  ───────┼───────┼────────────
   42720 │ 42724 │ +4 (+5 -1) 
  
  + CUSTOMER_SHEET_CUSTOMER_SESSION_ELEMENTS_SESSION_LOAD_FAILURE
  + CUSTOMER_SHEET_CUSTOMER_SESSION_ELEMENTS_SESSION_LOAD_SUCCESS
  + elements.customer_sheet.customer_session.elements_session.load_failure
  + elements.customer_sheet.customer_session.elements_session.load_success
  + ~~R8{"backend":"dex","compilation-mode":"release","has-checksums":false,"min-api":21,"pg-map-id":"762461f","r8-mode":"full","version":"8.5.35"}
  
  - ~~R8{"backend":"dex","compilation-mode":"release","has-checksums":false,"min-api":21,"pg-map-id":"7d54f78","r8-mode":"full","version":"8.5.35"}
  

METHODS:

   old   │ new   │ diff       
  ───────┼───────┼────────────
   60570 │ 60571 │ +1 (+3 -2) 
  
  + u5.Q a(Q, r0) → q
  + u5.Q b(Q, String)
  + u5.Q d(d) → Object
  
  - u5.Q a(Q, String)
  - u5.Q b(d) → Object
  

FIELDS:

   old   │ new   │ diff       
  ───────┼───────┼────────────
   40170 │ 40171 │ +1 (+9 -8) 
  
  + d7.c m0: c
  + d7.c n0: c[]
  + d7.d b0: d
  + d7.d c0: d[]
  + u5.P V: Object
  + u5.P W: r
  + u5.P X: int
  + u5.P Y: Object
  + u5.P Z: Q
  
  - d7.c m0: c[]
  - d7.d b0: d[]
  - u5.P V: C
  - u5.P W: Object
  - u5.P X: r
  - u5.P Y: int
  - u5.P Z: Object
  - u5.P a0: Q