fix(CodeImporter): identify lock and lock holder

[kojiromike]

• Try to identify who holds the lock
• Namespace locks by database

[Copilot]

Pull Request Overview

This PR enhances the CodeImporter's database locking mechanism to better identify lock holders and improve debugging capabilities when import processes conflict. The changes focus on making the locking system more robust and informative.

• Added connection ID tracking to identify which MySQL connection holds a lock
• Enhanced lock naming to include database name and handle MySQL's 64-character limit
• Improved error messages and logging with connection ID information for better debugging

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