Fix/remove some tests

[psoleckimoj]

Context

Does this issue have a Jira ticket?

No

If this is an issue, do we have steps to reproduce?

Sentry report https://ministryofjustice.sentry.io/issues/5411125793/?alert_rule_id=1210954&alert_timestamp=1716744980863&alert_type=email&environment=production&notification_uuid=d3d3cdf9-365b-415d-9b03-d1dce0e7cb22&project=5377056&referrer=alert_email

isInvalid method was not checking for undefined

Test updated.

Approved visitor tests removed as have been commented out for 3 years.

Intent

What changes are introduced by this PR that correspond to the above ticket?

Would this PR benefit from screenshots?

Considerations

Is there any additional information that would help when reviewing this PR?

Are there any steps required when merging/deploying this PR?

Checklist

• This PR contains only changes related to the above ticket
• Tests have been added/updated to cover the change
• Documentation has been updated where appropriate
• Tested in Development

[Eli-TW]

Amazing