Validate auth0_email_provider credential with the terraform validate command

[AshleyEke]

Checklist

• I agree to the terms within the Auth0 Code of Conduct.

Describe the problem you'd like to have solved

Currently if you try and apply an email provider resource without anything set in the email_provider_credentials property, you get the following error when trying to apply:

Error: 400 Bad Request: Payload validation error: 'None of the valid schemas were met' on property credentials (Credentials required to use the provider). Inner errors: [ Payload validation error: 'Missing required property: api_key' on property credentials. (also) Payload validation error: 'Too few properties defined (0), minimum 1' on property credentials. ].

Describe the ideal solution

It would be best if this error could be flagged when running terraform validate as it's very inconvenient, and too late in the process for it to fail when applying.

Alternatives and current workarounds

No response

Additional context

No response