[metrics-bugs] #22287 [Metrics/Onionoo]: Switch from custom CollecTor downloader to metrics-lib's DescriptorCollector

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#22287: Switch from custom CollecTor downloader to metrics-lib's
DescriptorCollector
---------------------------------+--------------------------
     Reporter:  karsten          |      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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 I noticed the other day that Onionoo still parses CollecTor's Apache
 directory listings to download descriptors.  We should switch to metrics-
 lib's `DescriptorCollector` which uses CollecTor's `index.json` for this
 purpose by default.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22287>
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