Revert "Allow different versions for differently signed RoT images (#… (

#5868)

…5580)"

This reverts commit 94ef8e5.

It turns out there are several places that are still making assumptions
about versions. Until we've identified them all just revert this change
to avoid any unexpected surprises.

tufaceous-lib/src/assemble/manifest.rs

@@ -294,14 +294,11 @@ impl<'a> FakeDataAttributes<'a> {
             KnownArtifactKind::SwitchRot => "fake-sidecar-rot",
         };
 
-        // For our purposes sign = board represents what we want for the RoT
-        // and we don't care about the SP at this point
         let caboose = CabooseBuilder::default()
             .git_commit("this-is-fake-data")
             .board(board)
             .version(self.version.to_string())
             .name(self.name)
-            .sign(board)
             .build();
 
         let mut builder = HubrisArchiveBuilder::with_fake_image();