Fix & standardize Validation tests across all countries

[AlexOlival]

This problem was found thanks to #57:

public function test_validation_behaviour(): void
{
    foreach ($this->validIds as $id) {
        $this->assertTrue(
            Socrates::validateId($id, 'PT')
        );
    }
    
    // Here be dragons...
    $this->expectException(InvalidLengthException::class);

    Socrates::validateId('11084129 8 ZX', 'PT');

    // Everything here passes...
    $this->assertFalse(
        Socrates::validateId('14897475 4 ZY5', 'PT')
    );
}

Not only some countries test for a single invalid ID - which isn't ideal - but even those that test with multiple of those have that same problem.

The correct order of assertions should be:

public function test_validation_behaviour(): void
{
    foreach ($this->validIds as $id) {
        $this->assertTrue(
            Socrates::validateId($id, 'PT')
        );
    }

    foreach ($this->invalidIds as $invalidId) {
        $this->assertFalse(
            Socrates::validateId($invalidId, 'PT')
        );
    }

    $this->expectException(InvalidLengthException::class);

    Socrates::validateId('11084129 8 ZX', 'PT');
}

So we need to ahead and fix these tests for all countries.

[AlexOlival]

As an addendum, it is slightly odd that we didn't find this problem before....

Validators were mostly implemented following the TDD logic, and with invalid IDs being tested against the algorithm as it was being developed.
I guess that as we try to tackle this, we will find out if there was something wrong with the test itself, or if it is a more insidious problem related to the environment...