Upgrader: use the alpha channel when the next version will be an alpha, beta, or RC.
The basic idea here is to make it easy for users of 3.0~betaN to upgrade to the next beta or RC, without having to type any command-line, and without having to create UDFs for these upgrade paths on the "stable" update channel (that would feel wrong, wouldn't it?). Bonus: once this is in place, more generally we'll be able to update our release process doc+scripts to stop creating meaningless "stable" channel upgrades for RCs, such as upgrade/v1/Tails/2.10~rc1/i386/stable/upgrades.yml, that we have been needing so far since our RCs thought they were using the "stable" update channel. refs: #12206
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