Drop support for packages-from-acng-log in our Puppet manifests

Originally created by @intrigeri on #11412 (Redmine)

We’ll want to merge this branch once feature/10748-gen-packages-manifest has been merged in all Tails release branches, and in turn into all active topic branches. And at the same time, we’ll want to drop the custom local::apt::proxy: false we set for isobuilders back then.

Feature Branch: lizard:feature/11412-drop-packages-from-acng-log-support,puppet-tails:feature/11412-drop-packages-from-acng-log-support

Parent Task: #5926 (closed)

Related issues

Blocked by tails#10748 (closed)

Edited May 15, 2020 by intrigeri

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