Copilot: Data Cleanup: remove unnecessary data

[quge009]

• rename kql doc directory for improved clarity
• remove unused sql files

[Copilot]

Pull Request Overview

This PR cleans up data organization by renaming the KQL document directory from "demoM3_LTP" to "LTP" for improved clarity and removing unused SQL configuration and files.

• Removes the SQLDB_DIR configuration constant and replaces it with inline path construction
• Updates KQL document paths from "demoM3_LTP" to "LTP" for better naming consistency
• Removes unused SQL-related files and build script copying operation

Reviewed Changes

Copilot reviewed 8 out of 25 changed files in this pull request and generated no comments.

File	Description
src/copilot-chat/src/copilot_agent/utils/sql.py	Replaces SQLDB_DIR import with inline path construction using DATA_DIR
src/copilot-chat/src/copilot_agent/ltp/ltp_dashboard.py	Updates KQL document paths from "demoM3_LTP" to "LTP" directory
src/copilot-chat/src/copilot_agent/config.py	Removes SQLDB_DIR configuration constant
src/copilot-chat/build/build-pre.sh	Removes copying operation for dashboard tables

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