Refactor SBOM generation

[martincostello]

• Only generate on Windows.
• Rename file.

[Copilot]

Pull Request Overview

This PR refactors the SBOM generation process by restricting it to run only on Windows and renaming the generated SBOM file.

• Only generates SBOM on Windows runners
• Renames the generated artifact and output file for clarity

Comments suppressed due to low confidence (2)

.github/workflows/build.yml:87

• The new artifact name 'xunit-logging.spdx.json' may be misleading if the file content remains an SBOM. Consider using a name that more clearly reflects its purpose.

        artifact-name: xunit-logging.spdx.json

.github/workflows/build.yml:88

• Ensure that the new output file name accurately reflects its content. If the file is an SBOM, a name such as 'sbom.spdx.json' might be more intuitive.

        output-file: ./artifacts/xunit-logging.spdx.json

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.59%. Comparing base (3666116) to head (4fcecd0).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #947   +/-   ##
=======================================
  Coverage   98.59%   98.59%           
=======================================
  Files          16       16           
  Lines         284      284           
  Branches       37       37           
=======================================
  Hits          280      280           
  Misses          2        2           
  Partials        2        2           

Flag	Coverage Δ
linux	98.59% <ø> (ø)
macos	97.88% <ø> (-0.71%)	⬇️
windows	98.59% <ø> (ø)

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