Rework WalletTest::get_confirmed_sends trait method

[str4d]

No description provided.

[nuttycom]

utACK with request for additional documentation

[str4d]

Force-pushed to add requested documentation.

[nuttycom]

utACK 9b8094b

[codecov]

Codecov Report

Attention: Patch coverage is 89.28571% with 3 lines in your changes missing coverage. Please review.

Project coverage is 61.63%. Comparing base (d8db481) to head (9b8094b).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
zcash_client_backend/src/data_api/testing/pool.rs	87.50%	2 Missing ⚠️
zcash_client_sqlite/src/lib.rs	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1551      +/-   ##
==========================================
+ Coverage   61.32%   61.63%   +0.31%     
==========================================
  Files         147      148       +1     
  Lines       18667    18821     +154     
==========================================
+ Hits        11447    11600     +153     
- Misses       7220     7221       +1     

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