[tor-bugs] #26399 [Core Tor/Tor]: remove redundant "testing" feature from tor_log crate

[Tor Bug Tracker & Wiki]

#26399: remove redundant "testing" feature from tor_log crate
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     Reporter:  isis          |      Owner:  isis
         Type:  defect        |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.3.4.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: 0.3.3.1-alpha
     Severity:  Normal        |   Keywords:  rust, tor-test, fast-fix
Actual Points:                |  Parent ID:
       Points:  1             |   Reviewer:
      Sponsor:  Sponsor8-can  |
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 It appears to be synonymous with the "test" feature that's already
 builtin. This is needed for part of #26398.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26399>
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