chore: update vitest to v2

[tomiir]

Description

• Updates vitest to V2 in root package.json
• Adds vitest as dev dependency in core

Type of change

• Chore (non-breaking change that addresses non-functional tasks, maintenance, or code quality improvements)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• Code in this PR is covered by automated tests (Unit tests, E2E tests)
• My changes generate no new warnings
• I have reviewed my own code
• I have filled out all required sections

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[enesozturk]

@tomiir should we add "@vitest/coverage-v8": "2.0.5" to wallet package?