[tor-bugs] #31310 [Circumvention/Snowflake]: Refactor/remove proxy-pair state machine in webextension

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#31310: Refactor/remove proxy-pair state machine in webextension
-------------------------------------+------------------------------
 Reporter:  cohosh                   |          Owner:  cohosh
     Type:  defect                   |         Status:  needs_review
 Priority:  Medium                   |      Milestone:
Component:  Circumvention/Snowflake  |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:  snowflake-webextension   |  Actual Points:
Parent ID:                           |         Points:  2
 Reviewer:                           |        Sponsor:  Sponsor28
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Changes (by cohosh):

 * status:  assigned => needs_review


Comment:

 These changes remove the "active" and "running" properties of the
 proxypairs: https://github.com/cohosh/snowflake/pull/12

 As discussed in #31100, we switch to using the existence of the proxy
 pairs themselves to mean they are active. I also removed the snowflake
 MODE state machine because it was unecessary and moved some comments
 around to make the code more readable.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31310#comment:3>
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