Wait for nodes with text in e2e tests

[amk-stripe]

Summary

Wait for nodes with text in e2e tests

Motivation

Reduce test flakiness.

I made this change for TestBacs last week, but we ran into a similar issue in TestBoleto today, so I think we should make this change more generally.

Testing

• Added tests
• Modified tests
• Manually verified

CI confirms that the tests that use this still pass

[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 MiB │       2 MiB │  0 B │     4.2 MiB │     4.2 MiB │  0 B 
     arsc │ 1,023.8 KiB │ 1,023.8 KiB │  0 B │ 1,023.7 KiB │ 1,023.7 KiB │  0 B 
 manifest │     2.3 KiB │     2.3 KiB │  0 B │       8 KiB │       8 KiB │  0 B 
      res │   301.5 KiB │   301.5 KiB │  0 B │     455 KiB │     455 KiB │  0 B 
   native │     6.2 MiB │     6.2 MiB │  0 B │    15.8 MiB │    15.8 MiB │  0 B 
    asset │     6.7 KiB │     6.7 KiB │  0 B │     6.5 KiB │     6.5 KiB │  0 B 
    other │    85.5 KiB │    85.5 KiB │ -4 B │   158.7 KiB │   158.7 KiB │  0 B 
──────────┼─────────────┼─────────────┼──────┼─────────────┼─────────────┼──────
    total │     9.6 MiB │     9.6 MiB │ -4 B │    21.6 MiB │    21.6 MiB │  0 B 

 DEX     │ old   │ new   │ diff      
─────────┼───────┼───────┼───────────
   files │     1 │     1 │ 0         
 strings │ 21305 │ 21305 │ 0 (+0 -0) 
   types │  6770 │  6770 │ 0 (+0 -0) 
 classes │  5559 │  5559 │ 0 (+0 -0) 
 methods │ 31121 │ 31121 │ 0 (+0 -0) 
  fields │ 18141 │ 18141 │ 0 (+0 -0) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  164 │  164 │  0   
 entries │ 3392 │ 3392 │  0

APK

   compressed    │   uncompressed   │                        
──────────┬──────┼───────────┬──────┤                        
 size     │ diff │ size      │ diff │ path                   
──────────┼──────┼───────────┼──────┼────────────────────────
 28.3 KiB │ -4 B │  62.6 KiB │  0 B │ ∆ META-INF/CERT.SF     
  1.2 KiB │ -1 B │   1.2 KiB │  0 B │ ∆ META-INF/CERT.RSA    
 25.1 KiB │ +1 B │  62.5 KiB │  0 B │ ∆ META-INF/MANIFEST.MF 
──────────┼──────┼───────────┼──────┼────────────────────────
 54.6 KiB │ -4 B │ 126.3 KiB │  0 B │ (total)