Pull Request Overview

This pull request removes unused code from the binlog_file.go file, cleaning up dead code that is no longer referenced anywhere in the codebase.

• Removes four unused methods: PreviousFileCoordinatesBy, PreviousFileCoordinates, NextFileCoordinates, and DetachedCoordinates
• Removes the unused detachPattern regex variable and its initialization
• Removes unused imports (errors and regexp) that were only needed by the deleted code

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