[Merge] ~lamoura/update-notifier:update-esm-handling into update-notifier:master

[Lucas Albuquerque Medeiros de Moura]

The proposal to merge ~lamoura/update-notifier:update-esm-handling into update-notifier:master has been updated.

Description changed to:

Currently, the apt-check script is configured to only handle package count for ESM Infra. We are now updating the logic to also handle ESM Apps packages as well.

Furthermore, we are also updating the messaging that is created in apt-check. We are advertising ESM Apps if the service is disabled and only messaging about ESM Infra if the distro is already on ESM mode.

Finally, this PR also fixes LP #1883315, since we now check to see if the system has esm-infra or esm-apps before performing a package count for package with esm origins

For more details, see:
https://code.launchpad.net/~lamoura/update-notifier/+git/update-notifier/+merge/401002
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