CI改善

[sushichan044]

Outline

• PR Helper workflow 追加
• renovate の PRに対して changesets を自動生成
• Node.js / pnpm の setup を共通化
• snapshot testを手動実行するコマンドを削除 cae658b45dbb3e596fa14f4f6c11a7570a03e13c
  • 65fc66b42b66a16975252b10343ac2959a066b30 により snapshot を更新したときに test が走るようになったため

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: f4e5532529d19ffdb9c5af9cfb7e2909a30174d3

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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