Add optional label attribute for echo step to improve usability

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      Similar to JENKINS-55410

      Why?

      Seemingly if the message for echo step is too long, it solely prints "Print Message" in pipeline view, while for short messages it prints the message nicely: vs.

      For the latter I would like to set an optional label to e.g. "PhpStorm inspection results".

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            Assignee:
            Liam Newman
            Reporter:
            Reinhold Füreder
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              Created:
              Updated: