test: adds setup and teardown

[alejoamiras]

This PR introduces automated Aztec sandbox management and version checking, eliminating the need for manual setup before running tests.

🎯 Main Features

Automated Sandbox Startup

• Before: Developers had to manually start aztec start --sandbox before running tests
• After: Jest automatically starts and manages the sandbox during test execution
• Benefit: ✅ One-command testing with npm test - no manual setup required

Automatic Version Verification

• Before: No validation that installed Aztec CLI matches project requirements
• After: Automatic check against package.json config before tests run
• Benefit: ✅ Catches version mismatches early with clear upgrade instructions

[xorsal]

I think we'll eventually drop the version check because the Fairies team will add a version oracle to ensure the correct version in each possible instance that is required.

but until that time comes we're good