fix(ci): use latest nightly toolchain in the Test workflow, fix assert_matches import and the clippy warning

[svasista-ms]

The Lint workflow is failing with:

1. error[E0432]: unresolved import std::assert_matches[1]
2. clippy::map_unwrap_or (pedantic) warning promoted to failure in the job configuration. [2]

I updated my local dev machine to match the toolchain versions used by the pipeline and reproduced the same failure locally.

Also, the issue in macrotest[3] due to which the Test flow's nightly toolchain version was pinned (to nightly-2025-11-20) is now resolved.

In this PR:

1. Test workflow is updated to use the latest nightly toolchain
2. The assert_matches import is fixed.
3. clippy pedantic warning in wdk-build is fixed by replacing env::var(...).map(...).unwrap_or(false) with Result::is_ok_and(...) in is_cargo_make_color_disabled fn.

[Copilot]

Pull request overview

This PR fixes CI failures by removing the dependency on the nightly-only std::assert_matches macro and addresses a clippy pedantic warning.

Changes:

• Replaced all assert_matches! macro usages with stable assert!(matches!(...)) alternatives in test code
• Refactored is_cargo_make_color_disabled() to use Result::is_ok_and() instead of .map().unwrap_or() pattern, fixing a clippy pedantic warning

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
crates/wdk-build/src/lib.rs	Removed nightly-only assert_matches import and converted all test assertions to use stable matches! macro within assert! calls
crates/wdk-build/src/cargo_make.rs	Refactored environment variable checking to use is_ok_and() for cleaner, more idiomatic code

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.23%. Comparing base (8046305) to head (943b0f6).

Files with missing lines	Patch %	Lines
crates/wdk-build/src/cargo_make.rs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #604      +/-   ##
==========================================
+ Coverage   76.52%   77.23%   +0.71%     
==========================================
  Files          24       24              
  Lines        4881     4783      -98     
  Branches     4881     4783      -98     
==========================================
- Hits         3735     3694      -41     
+ Misses       1029      972      -57     
  Partials      117      117              

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