[tahoe-lafs-trac-stream] [Tahoe-LAFS] #4006: Remove the Ubuntu unit test jobs from GitHub Actions

[Tahoe-LAFS]

#4006: Remove the Ubuntu unit test jobs from GitHub Actions
---------------------+---------------------------
 Reporter:  exarkun  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
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 This is part of https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3949.  See
 that ticket for details.

 The scope of this ticket is *just* the unit test jobs (not the integration
 test jobs).

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4006>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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