feat(vscode): rename to SQLMesh prefix

[benfdking]

• add unit testing framework

[Copilot]

Pull Request Overview

This PR renames VS Code command titles to include the "SQLMesh:" prefix and sets up a unit testing framework using Vitest.

• Introduces a Vitest configuration file and related build/test configuration updates.
• Adjusts command titles in package.json and enhances ESLint and esbuild configurations to accommodate the new testing setup.

Reviewed Changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
vscode/extension/vitest.config.ts	Adds Vitest config for test framework integration.
vscode/extension/tsconfig.test.json	Introduces test-specific TypeScript configuration.
vscode/extension/tsconfig.json	Updates exclusion settings to ignore test files in build.
vscode/extension/tsconfig.build.json	Sets up TS build configuration with additional exclusions.
vscode/extension/src/commands/commands.test.ts	Adds a test to verify command titles start with "SQLMesh: ".
vscode/extension/package.json	Updates command titles and test-related scripts and dependencies.
vscode/extension/eslint.config.mjs	Configures ESLint rules for TypeScript test files.
vscode/extension/esbuild.js	Adds plugin to exclude test files from the build.
vscode/extension/.vscodeignore	Expands ignore patterns to include test files and related config.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported