[tor-bugs] #27189 [Core Tor/Tor]: cleanup rust code

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#27189: cleanup rust code
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     Reporter:  cyberpunks    |      Owner:  (none)
         Type:  task          |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  rust
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 There are low-hanging fruit for silencing clippy lints, removing
 unnecessary allocations, and writing a more efficient version of
 `.retain()`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27189>
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