Partially revert "Remove obsolete cleanup of obsolete stamp files" #419
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This reverts part of commit 1338aae.
Sadly I had not realised that this stamp file was also created by a hook in the image builder. So on every new system installed between 3.5.0 and 6.0.1 inclusive, this stamp file was preinstalled and deleted on first boot; while on all systems installed with 6.0.2 or newer, the stamp file was preinstalled but never removed.
endlessm/eos-image-builder#173 removes the image builder hook, but for the sake of those systems installed with 6.0.2 or newer, reinstate the tmpfiles snippet that deletes the stamp file.