describe-changes@v1: with concatenate mode: append

✨ PR Description

Purpose: Add comprehensive integration test suite for DBT project functionality to improve test coverage and validate core DBT operations including project management, SQL execution, and diagnostics.

Main changes:

• Added extensive test suite for DBTProject class covering initialization, configuration, event handling, diagnostics, and model operations
• Added comprehensive test suite for DBTProjectContainer class covering lifecycle management, SQL operations, and workspace folder handling
• Enhanced Jest test configuration with summary reporter and updated VSCode mock implementations for Uri, workspace, and progress APIs

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