[tor-bugs] #18912 [Applications/Tor Browser]: add automated tests for updater cert pinning

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#18912: add automated tests for updater cert pinning
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     Reporter:  mcs                       |      Owner:  mcs
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  ff45-esr
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 This is a spinoff of #17442. We want to add automated tests to ensure that
 we notice if Mozilla changes something that breaks the updater cert
 pinning.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18912>
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