Added logic to support recursive searching of upstream visits

[tieneupin]

The current logic for find_upstream_visits looks only in the folder specified. This is a problem as it means that, in the event the data is saved by year, the machine config will have to be updated with the new year, and access to the old year's data will be lost.

To circumvent this, we implement recursive searching logic, such that Murfey will recursively search through the specified number of layers in the stated data directory to find matches for the current visit. This solution allows for the current upstream_data_directories key format to be kept as-is, while future-proofing the code as the years go by, allowing past visits to continue to be exposed until they are deleted from the system.

[codecov]

Codecov Report

❌ Patch coverage is 82.14286% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.04%. Comparing base (6f96b62) to head (f8ebe2a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #725      +/-   ##
==========================================
+ Coverage   46.01%   46.04%   +0.03%     
==========================================
  Files          91       91              
  Lines        9625     9636      +11     
  Branches     1256     1260       +4     
==========================================
+ Hits         4429     4437       +8     
- Misses       4977     4978       +1     
- Partials      219      221       +2     

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[stephen-riggs]

Looks much better now the function has everything in scope