Description

While testing some constraints implemented using the symfony validator component I found the ConstraintViolationAssertion is marked as internal. This causes some complains on tools like psalm on level 3.

The use case occurs on simple validations like:

    public function testInvalidValues($value, $valueAsString)
    {
        $constraint = new Blank([
            'message' => 'myMessage',
        ]);

        $this->validator->validate($value, $constraint);

        $this->buildViolation('myMessage')
            ->setParameter('{{ value }}', $valueAsString)
            ->setCode(Blank::NOT_BLANK_ERROR)
            ->assertRaised();
    }

the buildViolation method generate an instance of ConstraintViolationAssertion and calling on any method there could be unsafe cause it is marked as internal.

The code that should be removed is: https://github.com/symfony/symfony/blob/5.4/src/Symfony/Component/Validator/Test/ConstraintValidatorTestCase.php#L296-L298

I can do the PR if it is ok.