Track the main loop for cleanup

[awush-stripe]

Summary

Track the main loop job for cleanup on cancel

Motivation

Make sure the main loop job is canceled when the scan is canceled.

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: none)
NEW: paymentsheet-example-release-pr.apk (signature: none)

          │          compressed          │         uncompressed         
          ├───────────┬───────────┬──────┼───────────┬───────────┬──────
 APK      │ old       │ new       │ diff │ old       │ new       │ diff 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
      dex │  11.8 MiB │  11.8 MiB │  0 B │  40.1 MiB │  40.1 MiB │  0 B 
     arsc │   1.6 MiB │   1.6 MiB │  0 B │   1.6 MiB │   1.6 MiB │  0 B 
 manifest │   2.6 KiB │   2.6 KiB │  0 B │  10.8 KiB │  10.8 KiB │  0 B 
      res │ 697.1 KiB │ 697.1 KiB │  0 B │   1.1 MiB │   1.1 MiB │  0 B 
    asset │  77.8 KiB │  77.8 KiB │  0 B │ 109.2 KiB │ 109.2 KiB │  0 B 
    other │  78.3 KiB │  78.3 KiB │  0 B │   154 KiB │   154 KiB │  0 B 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
    total │  14.2 MiB │  14.2 MiB │  0 B │    43 MiB │    43 MiB │  0 B 


         │          raw           │           unique            
         ├────────┬────────┬──────┼────────┬────────┬───────────
 DEX     │ old    │ new    │ diff │ old    │ new    │ diff      
─────────┼────────┼────────┼──────┼────────┼────────┼───────────
   files │      3 │      3 │    0 │        │        │           
 strings │ 188329 │ 188329 │    0 │ 170316 │ 170316 │ 0 (+0 -0) 
   types │  32883 │  32883 │    0 │  30876 │  30876 │ 0 (+0 -0) 
 classes │  28485 │  28485 │    0 │  28485 │  28485 │ 0 (+0 -0) 
 methods │ 165473 │ 165473 │    0 │ 160577 │ 160577 │ 0 (+0 -0) 
  fields │ 121355 │ 121355 │    0 │ 120682 │ 120682 │ 0 (+0 -0) 


 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  297 │  297 │  0   
 entries │ 5389 │ 5389 │  0