[Merge] ~renanrodrigo/update-notifier:esm-cache-update into update-notifier:master

[Renan Rodrigo]

Renan Rodrigo has proposed merging ~renanrodrigo/update-notifier:esm-cache-update into update-notifier:master.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #2002168 in update-notifier (Ubuntu): "apt-check needs to consider the pro client's esm cache for updates when esm is disabled"
  https://bugs.launchpad.net/ubuntu/+source/update-notifier/+bug/2002168

For more details, see:
https://code.launchpad.net/~renanrodrigo/update-notifier/+git/update-notifier/+merge/435293

Rely on the Pro Client apt esm cache to check for esm updates

The Pro Client is not pinnning esm repositores and adding them to the system apt anymore, but using a separate cache instead.
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~renanrodrigo/update-notifier:esm-cache-update into update-notifier:master.
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