Update dependencies and fix security vulnerabilities

- Upgrade all dev dependencies to latest versions
- Migrate from deprecated vscode-test to @vscode/test-electron
- Upgrade TypeScript from 3.3.1 to 5.7.2
- Upgrade Mocha from 6.1.4 to 10.8.2
- Update glob to v13 with promise-based API
- Remove deprecated tslint package
- Update minimum VS Code engine to 1.85.0
- Remove activationEvents (auto-generated by VS Code)
- Fix Mocha configuration (useColors → color)
- Update glob API usage from callbacks to promises

Resolves security vulnerabilities

Author: Jeyfel