[metrics-bugs] #22288 [Metrics/Metrics website]: Use newly recognized OnionPerf keys

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#22288: Use newly recognized OnionPerf keys
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     Reporter:  karsten                  |      Owner:  metrics-team
         Type:  enhancement              |     Status:  new
     Priority:  Medium                   |  Milestone:
    Component:  Metrics/Metrics website  |    Version:
     Severity:  Normal                   |   Keywords:
Actual Points:                           |  Parent ID:
       Points:                           |   Reviewer:
      Sponsor:                           |
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 In metrics-lib 1.7.0 we added support for six new Torperf keys added by
 OnionPerf (#22122).  Let's switch from the workaround that went through
 `getUnrecognizedKeys()` and use the new methods instead.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22288>
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