[Merge] ~nteodosio/update-manager:bionic-ua into update-manager:main

[Nathan Teodosio]

Nathan Teodosio has proposed merging ~nteodosio/update-manager:bionic-ua into update-manager:main.

Requested reviews:
  Elio Qoshi (elioqoshi)
  Sebastien Bacher (seb128)
Related bugs:
  Bug #1826213 in update-manager (Ubuntu): "/usr/bin/update-manager:AttributeError:/usr/bin/update-manager at 118:start_update:start_available:refresh_cache:update"
  https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1826213
  Bug #1929865 in update-manager (Ubuntu): "autopkgtests fail due to precise being removed from the archive"
  https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1929865
  Bug #1990450 in update-manager (Ubuntu): "Show potential Ubuntu Pro updates"
  https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1990450

For more details, see:
https://code.launchpad.net/~nteodosio/update-manager/+git/update-manager/+merge/446967

Implement the redesign of Ubuntu Pro in Update Manager.

PPA: https://launchpad.net/~nteodosio/+archive/ubuntu/ubuntu-pro/+packages

Still doesn't display Ubuntu Pro packages as such when already attached, rather they're listed as normal updates.

Main differences are:

    - Fuse the description and changes tabs into a single view, which is
      now separated with a GtkPaned widget from the tree widget above.
    - Add button to attach to enable Ubuntu Pro if it is the only action
      available.
    - Ubuntu base -> System components.
    - Fix Ubuntu Pro item not being a parent group of its corresponding
      packages.
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