[FIX] Save Data: fix when saving to different drives on Windows

[markotoplak]

Issue

Fixes #7018

Includes

• Code changes
• Tests
• Documentation

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88.47%. Comparing base (8542122) to head (f995a0b).

❌ Your patch check has failed because the patch coverage (66.66%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7019      +/-   ##
==========================================
- Coverage   88.48%   88.47%   -0.02%     
==========================================
  Files         332      332              
  Lines       73334    73337       +3     
==========================================
- Hits        64890    64885       -5     
- Misses       8444     8452       +8     

[markotoplak]

I added some paths to owsavebase windows tests in the first commit. I've verified that they were able to reproduce the issue on Github Actions.

The modified code does not exhibit the same issue anymore.