Fixes #21764. I think is very simple, but flexible. The date may be set early, for distros that have a fixed schedule, but it doesn't have to. So for example Debian could push out an update that sets a few months before the release goes EOL. And various tools, in particular graphical desktops, can start nagging people to upgrade a few weeks before the date. As discussed in the bug, we don't need granularity higher than a day. And this means that we can use a simple human- and machine-readable format. I was considering other names, e.g. something with "EOL", but I think that "SUPPORT_END" is better because it doesn't imply that the machine will somehow stop working. This is supposed to be an advisory, nothing more.
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