BanyanDB: make BanyanDBMetricsDAO output scan all blocks info log only when the model is not indexModel.

[wankai123]

• If this pull request closes/resolves/fixes an existing issue, replace the issue number. Closes #.
• Update the CHANGES log.

[Copilot]

Pull Request Overview

This PR improves logging behavior in BanyanDBMetricsDAO by adding a condition to only output "scan all blocks" info logs when the model is not in index mode.

• Adds a conditional check to prevent unnecessary log messages for index models
• Improves log clarity by reducing noise when scanning is expected behavior

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