fix: verify result should be false if error

[TimoGlastra]

The isValid value of SdJwtVc.verify return object would be true, if though containsRequiredVcProperties or containsExpectedKeyBinding could be false.

I think isValid should only be true if all checks and validation have passed, so I made this PR to make it so that it is true. There is a test that tested the flow as it used to be (isValid: true, but other fields having false value), so if it was on purpose I think we should maybe reconsider it, as it was kinda confusing.

How I've handled it in the past is to create a nested validation object, to separate the overall check (isValid) from the individual checks:

{
  // will only be true if all validations are true
  isValid: true,
  validations: {
     containsRequiredVcProperties: true
  }
}