Allow using err for errors in tremor run

[Licenser]

Pull request

Description

Allow using err as a target for tremor run pipelines

Related

• Related Issues: fixes tremor run does not use the err port #591

Checklist

• The RFC, if required, has been submitted and approved
• Any user-facing impact of the changes is reflected in docs.tremor.rs
• The code is tested
• Use of unsafe code is reasoned about in a comment

[codecov]

Codecov Report

Merging #592 (927527b) into main (fca7a55) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #592   +/-   ##
=======================================
  Coverage   80.59%   80.59%           
=======================================
  Files         101      101           
  Lines       13916    13916           
=======================================
  Hits        11215    11215           
  Misses       2701     2701           

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