[tor-bugs] #28821 [Core Tor/Tor]: Introduce timer_is_scheduled() method and replace padding_scheduled_at_us

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#28821: Introduce timer_is_scheduled() method and replace padding_scheduled_at_us
-------------------------+-------------------------------------------------
     Reporter:  asn      |      Owner:  (none)
         Type:  defect   |     Status:  new
     Priority:  Medium   |  Milestone:  Tor: unspecified
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  wtf-pad, tor-relay, tor-cell,
     Severity:  Normal   |  padding, refactoring
Actual Points:           |  Parent ID:  #28637
       Points:           |   Reviewer:
      Sponsor:           |
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 This came up during #28142 review:
 https://github.com/torproject/tor/pull/461#discussion_r231889687

 When #28142 gets merged, we can do a small refactoring by removing
 `padding_scheduled_at_us` and replacing it with a new timer method that
 returns true if the timer is scheduled, and false if it's disabled.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28821>
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