Use setup-soldr in CI workers

[zackees]

Summary

• replace manual soldr/rustup setup in Rust worker workflows with zackees/setup-soldr@v0
• remove source-building soldr from macOS/Windows check workers and native build template
• enable setup-soldr cache, zccache build-cache, and Cargo target-cache where useful
• keep fbuild's embedded toolchain/build artifact caches in template_build.yml
• keep explicit rustup target add steps in native builds for cross-target stdlibs

Closes #183.

Testing

• git diff --check
• actionlint

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: a4cfd0c6-7692-4b06-9f45-a365014542b7

📥 Commits

Reviewing files that changed from the base of the PR and between 299d0e3 and 72f9a98.

📒 Files selected for processing (8)

• .github/workflows/check-macos.yml
• .github/workflows/check-ubuntu.yml
• .github/workflows/check-windows.yml
• .github/workflows/docs.yml
• .github/workflows/fmt.yml
• .github/workflows/msrv.yml
• .github/workflows/template_build.yml
• .github/workflows/template_native_build.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/183-setup-soldr-workers

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