[tor-bugs] #27180 [Metrics/Onionoo]: Remove DetailsDocumentFields interface

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#27180: Remove DetailsDocumentFields interface
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     Reporter:  irl              |      Owner:  metrics-team
         Type:  enhancement      |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Onionoo  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 This interface "Provides constants for details document field names".

 In practice, it only provides 2 of them, and they're only used in one
 function that is full of other hard coded strings.

 We can remove this to reduce complexity.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27180>
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