[tor-bugs] #33995 [Circumvention/Snowflake]: Move pc.CreateOffer and pc.SetLocalDescription out of a goroutine

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#33995: Move pc.CreateOffer and pc.SetLocalDescription out of a goroutine
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     Reporter:  dcf                      |      Owner:  dcf
         Type:  enhancement              |     Status:  assigned
     Priority:  Medium                   |  Milestone:
    Component:  Circumvention/Snowflake  |    Version:
     Severity:  Normal                   |   Keywords:
Actual Points:                           |  Parent ID:
       Points:                           |   Reviewer:
      Sponsor:                           |
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 This code was formerly the `OnNegotiationNeeded` handler before the switch
 on pion (comment:28:ticket:28942). We are blocking on `offerChannel`
 anyway, so we may as well run these operations synchronously and use a
 normal error return.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33995>
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