Remove test's report destination

[abelsromero]

I think this Gradle customization could be removed.

asciidoctorj-core and asciidoctorj-wildfly-integration-test customize the destination path of test reports with

  reports {
    html {
      destination file("$buildDir/reports/${task.name}")
    }
    junitXml {
      destination file("$buildDir/${task.name}-result")
    }
  }

But the default configuration for reports already separates them by task:

• HTML: build/reports/tests/${task.name}
• JUnitXml: build/test-results/${task.name}

Maybe this was necessary at some point but does not seem the case now. Removing it we can safe a few lines :grin:

NOTE: if the change is applied, we need to update the path of the upload artifacts step in CI.

[robertpanzer]

Sounds good! The more we can rely on the conventions the better.