[JENKINS-31247] Copyartifact: more integration with workflow - Jenkins JIRA

Details

(current feature)
Copyartifact 1.34 introduced integration with workflow plugin.
You can use copyartifact in workflow jobs like this:

step([
  $class: 'CopyArtifact', projectName: 'test', filter: '**/*',
  selector: [$class: 'StatusBuildSelector', stable: false]
])

(expected improvement)
Workflow plugin provides plugins a way to define its own step functions like this:

copyartifact projectName: 'test', filter: '**/*', selector: [$class: 'StatusBuildSelector', stable: false]

depends on

JENKINS-29922 Promote delegates of metasteps to top-level functions, deprecate $class