Remove validation from Vat constructor and related test cleanup

[Copilot]

This PR removes validation logic from the Vat constructor that was preventing negative amounts, along with cleaning up related test code and unused imports.

Changes made:

1. Removed validation from Vat constructor: Eliminated Validator::checkNumberPositiveOrZero($amount) check that was throwing exceptions for negative amounts
2. Cleaned up imports: Removed unused use SlevomatCsobGateway\Validator; import from Vat class
3. Removed validation test: Deleted the testValidation() method from VatTest that was specifically testing the removed validation logic
4. Cleaned up test imports: Removed unused use InvalidArgumentException; import from VatTest

The Vat class now accepts any integer amount value (including negative values) without validation, while maintaining all other functionality. The remaining tests continue to verify the core encoding behavior.

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[janlanger]

@copilot remove also test that tested the validation (VatTest)

[Copilot]

@copilot remove also test that tested the validation (VatTest)

Removed the validation test method and unused InvalidArgumentException import from VatTest as requested. Commit: db12bb1

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