[Merge] ~nteodosio/update-manager:no-internet into update-manager:main

[Nathan Teodosio]

Nathan Teodosio has proposed merging ~nteodosio/update-manager:no-internet into update-manager:main.

Requested reviews:
  Sebastien Bacher (seb128)
Related bugs:
  Bug #2084130 in update-manager (Ubuntu): "Changes window is blank when not connected to the Internet"
  https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/2084130

For more details, see:
https://code.launchpad.net/~nteodosio/update-manager/+git/update-manager/+merge/475176

If offline the changes window is empty but before it showed a message saying

"No network connection detected, you can not download "
                     "changelog information."

This regression was introduced in

--->
commit 10ee388c41182084e559b347aa4fab7c3bbc5f01
Author: Nathan Pratta Teodosio <nathan.teodosio at canonical.com>
Date:   Fri Jul 21 10:48:35 2023 +0200

    Implement the new Ubuntu Pro design.

    LP:1990450
<---
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