Fix Windows Paths in Coko Tests

[CodingDepot]

Complementing #836, this PR fixes more cases of the Path constructor being used on absolute windows paths.

Additionally, the import statement in Coko source code examples relies on invariant Path separators (forward slashes), which is now also properly applied.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.04%. Comparing base (890f615) to head (d827da2).
Report is 1 commits behind head on main.

❗ Current head d827da2 differs from pull request most recent head 99db8bc. Consider uploading reports for the commit 99db8bc to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #853   +/-   ##
=========================================
  Coverage     77.04%   77.04%           
  Complexity      250      250           
=========================================
  Files            59       59           
  Lines          1895     1895           
  Branches        265      265           
=========================================
  Hits           1460     1460           
  Misses          314      314           
  Partials        121      121           

Flag	Coverage Δ
unittests	77.04% <ø> (ø)

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