Add CI job for macos

[rukai]

Adds a basic CI job for macos.
This ensures that shotover and its tests continues to build on macos without any clippy warnings, but does not make any guarantees if the tests pass or not. (because many tests do not pass on macos)

Logic is mostly copied from the build.yaml job for linux.

Additionally all cpp tests are skipped because getting c++ driver tests compiling on macos is too much trouble.

[codspeed-hq]

Merging this PR will not alter performance

✅ 36 untouched benchmarks
⏩ 2 skipped benchmarks¹

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_{Comparing rukai:macos_ci (6c605c1) with main (37cdad6)²}

Footnotes

1. 2 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on main (34a310d) during the generation of this report, so 37cdad6 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[Copilot]

Pull request overview

Adds a dedicated GitHub Actions workflow to build/clippy the Rust workspace on macOS, aiming to keep macOS builds warning-free while explicitly excluding the C++ driver feature combinations.

Changes:

• Introduces a new build_macos.yaml workflow triggered on pushes/PRs to main.
• Runs cargo clippy and cargo hack --feature-powerset ... clippy on macos-latest.
• Excludes C++ driver test features from the macOS feature-powerset clippy run.

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