ci: enable longpaths in main.yml

[dyc3]

Summary

same fix as #11245

Test Plan

Docs

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Latest commit: 136e272

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[coderabbitai]

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ℹ️ Recent review info

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Run ID: 7506a89f-47b2-41b4-90ef-1cad47f088bb

📥 Commits

Reviewing files that changed from the base of the PR and between ed97192 and 136e272.

📒 Files selected for processing (1)

• .github/workflows/main.yml

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Walkthrough

The test job enables Git long-path support on Windows before checkout. The coverage job reformats its operating-system matrix without changing its values.

Possibly related PRs

• biomejs/biome#11245: Enables Git long paths for Windows runners in another CI workflow.

Suggested reviewers: ematipico

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch dyc3/fix-windows-builds-again

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