I noticed that we keep querying the preset database for transient units, which makes little sense, since transient units are well, transient, and hence not suject to enablement/disablement. Hence, let's shortcut things and simply not check the preset database for them. While we are at it, shortcut unit file state checks for transient units, too. We know they are transient already, we can return that directly, no need to go to disk. Finally, treat perpetual units like transient units for the the preset case: also bypass the preset database. (But keep checking for the unit file state for them, since it *is* relevant to know whether they were generated or not.)
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