ci: auto merge との相性改善

[sushichan044]

• vitest が通らないと auto merge できないので vitest が常に実行されるようにする
• update snaoshot label がついている branch で rebase が発生した場合も再度自動的に snapshot update したい

[changeset-bot]

⚠️ No Changeset found

Latest commit: fa3c36a

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[github-actions]

✅ Snapshot test success

See the details: workflow run