fix: warn when WDK env vars are non-UTF8

[gurry]

Fixes #580

[Copilot]

Pull request overview

This PR adds proper warning messages when WDK environment variables contain non-UTF8 characters, addressing issue #580. Previously, such errors were only logged at trace level without distinguishing between missing variables and encoding issues.

Key Changes:

• Added warning-level logging for non-UTF8 environment variables in get_path_from_env
• Distinguished between NotPresent and NotUnicode error variants with appropriate log levels

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.66%. Comparing base (dd8fdff) to head (1a3cb77).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/wdk-build/src/cargo_make.rs	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #596      +/-   ##
==========================================
- Coverage   82.67%   82.66%   -0.01%     
==========================================
  Files          25       25              
  Lines        7135     7137       +2     
  Branches     7135     7137       +2     
==========================================
+ Hits         5899     5900       +1     
- Misses       1107     1108       +1     
  Partials      129      129              

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[wmmc88]

LGTM, just one minor nit. Merge is going to have to wait for #597 and probably #598 to go in

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

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