chore: add close buffer xtask

[ananas-block]

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[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (4)

• Cargo.lock is excluded by !**/*.lock and included by none
• xtask/Cargo.toml is excluded by none and included by none
• xtask/src/close_buffer.rs is excluded by none and included by none
• xtask/src/main.rs is excluded by none and included by none

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/add-close-buffer-xtask

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