Allow to specify name (label) for rtGradleRun()

You can label a shell script with `sh label: xxx`

But for the artifactory plugin - `rtGradleRun(xxx)` steps all display as the same "run Artifactory gradle" - regardless what gradle tasks they run etc

If you have a lot of rtGradleRun steps - it is unclear in jenkins (Blue Ocean view) which steps are which.

I think the text for this label comes from here:

https://github.com/jenkinsci/artifactory-plugin/blob/73be393da5913343dd55e0ca5b09cab864930abb/src/main/java/org/jfrog/hudson/pipeline/declarative/steps/gradle/GradleStep.java#L215

It would be great if the rtGradleRun() step had a parameter to override this label.

(Or this there already some other way to do this?){}