[Bug 1920836] Re: Show Extended Security Maintenence status

[Chad Smith]

@brian-murray the verification-done-impish tag may be unnecessary here
by me. My above verification on impish may have just been supplemental
as 0.99.13 already had released which provided ESM awareness on Impish.
That said, I revalidated this because the current 0.99.13.1 also touched
that same logic and I wanted to confirm no regression.

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https://bugs.launchpad.net/bugs/1920836

Title:
  Show Extended Security Maintenence status

Status in software-properties package in Ubuntu:
  Fix Released
Status in software-properties source package in Xenial:
  New
Status in software-properties source package in Bionic:
  Fix Committed
Status in software-properties source package in Focal:
  Fix Committed
Status in software-properties source package in Hirsute:
  Fix Committed
Status in software-properties source package in Impish:
  Fix Committed

Bug description:
  [Impact]
  There is not currently a graphical method of determining if a system is subscribed to [Extended Security Maintenance](https://ubuntu.com/security/esm) updates. This is resolved by adding some [new UI](https://wiki.ubuntu.com/SoftwareUpdates#Extended_Security_Maintenance) to the software properties application.

  [Test Case]
  1. Install latest version of Ubuntu advantage:
  $ sudo add-apt-repository ppa:ua-client/stable
  $ sudo apt update
  $ sudo apt upgrade
  2. Open Software Properties
  3. Go to Updates tab.

  Expected result:
  Information is shown that indicates if this system is using Extended Security Maintenance updates, when updates will supported until, and a link to upgrade to ESM.

  Observed result:
  No ESM information currently shown.

  [Where problems could occur]
  - Software properties could hit a bug getting a response from the ua app. The current code carefully checks if and what is returned, falling back to a safe default behavior.
  - Launching software properties could trigger a bug in the ua app.
  - Software properties could show incorrect information, causing confusion for the user. The solution uses information from distro-info and the ua app which means software-properties contains no data about ESM, and instead relies on these apps that can be updated if things change.

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