Allow to specify closure for publications

[ddimtirov]

Allow to specify closure for publications. The use case is that we may want to publish automatically all publications defined by a project, even yf they are not available yet.

For example:

artifactory {
    publish {
        defaults {
            publications { extensions.findByType(PublishingExtension)?.publications?.names }
        }
    }
}

The change needs to go here:

https://github.com/JFrogDev/build-info/blob/6cede0a11a777c147dbc0ea05020620eb3b25dde/build-info-extractor-gradle/src/main/groovy/org/jfrog/gradle/plugin/artifactory/task/helper/TaskHelperPublications.java#L89