chore: suggest Jest exntesion for development

Description

This MR recommends for developers to install the jest extension:

• Marketplace https://marketplace.visualstudio.com/items?itemName=Orta.vscode-jest

What CHANGELOG entry will this MR create?

• fix: Bug fix fixes - a user-facing issue in production - included in changelog
• feature: New feature - a user-facing change which adds functionality - included in changelog
• BREAKING CHANGE: (fix or feature that would cause existing functionality to change) - should bump major version, mentioned in the changelog
• None - other non-user-facing changes