[metrics-bugs] #31649 [Metrics]: Add ant task in metrics-base to fetch metrics-lib/exonerator from dist

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#31649: Add ant task in metrics-base to fetch metrics-lib/exonerator from dist
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     Reporter:  irl       |      Owner:  metrics-team
         Type:  task      |     Status:  new
     Priority:  Very Low  |  Milestone:
    Component:  Metrics   |    Version:
     Severity:  Normal    |   Keywords:
Actual Points:            |  Parent ID:
       Points:            |   Reviewer:
      Sponsor:            |
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 We could use this in GitLab CI instead of having to update the CI
 configuration every time we switch version of metrics-lib/exonerator.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31649>
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