truststoreSecretName is set as required while supposed to be optional

[nemerna-finastra]

in the apiCurio CR, there is an ability to configure the storage as kafkasql/streams
where you can manage to set the authentication in two ways:

1. tls
2. scram

in the scram, there is a field called truststoreSecretName, which according to the documentation is a required field
and inaction, not setting this variable at all, will cause the operator not to generate other scram-related ENV variables in the registry deployment.

while in fact this field is supposed to be Optional, as when using Signed Certificates for Kafka listeners, there is no need to configure any truststore certs on the client-side, as those certificates are trusted by default

I am interested in a patch that can allow me not to set this variable, while the operator still creates other scram auth related env variables for the deployment resource