[tor-bugs] #28822 [Applications/Tor Browser]: re-implement desktop onboarding for ESR 68

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#28822: re-implement desktop onboarding for ESR 68
--------------------------------------------+------------------------------
 Reporter:  mcs                             |          Owner:  tbb-team
     Type:  defect                          |         Status:  needs_review
 Priority:  Medium                          |      Milestone:
Component:  Applications/Tor Browser        |        Version:
 Severity:  Normal                          |     Resolution:
 Keywords:  ff68-esr TorBrowserTeam201906R  |  Actual Points:
Parent ID:                                  |         Points:
 Reviewer:                                  |        Sponsor:
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Changes (by acat):

 * keywords:  ff68-esr => ff68-esr TorBrowserTeam201906R
 * status:  new => needs_review


Comment:

 Following mcs suggestion, I resurrected the onboarding system addon. Then
 I cherry picked the original Tor onboarding commits and finally converted
 the bootstrapped extension into a webextension + experimental API, which
 is how it was done for other extensions (e.g. `formautofill`).

 Implemented in 6 last commits of https://github.com/acatarineu/tor-
 browser/commits/28822 (based on current `30429` branch).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28822#comment:1>
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