Revert initsync revert (#12431)

* Revert "Revert "BeaconBlocksByRange and BlobSidecarsByRange consistency (#123… (#12426)"

This reverts commit ddc1e48e05.

* fix metrics bug, add batch.next tests

---------

Co-authored-by: Kasey Kirkham <kasey@users.noreply.github.com>

consensus-types/blocks/BUILD.bazel

@@ -7,6 +7,7 @@ go_library(
         "factory.go",
         "getters.go",
         "proto.go",
+        "roblock.go",
         "setters.go",
         "types.go",
     ],
@@ -36,6 +37,7 @@ go_test(
         "factory_test.go",
         "getters_test.go",
         "proto_test.go",
+        "roblock_test.go",
     ],
     embed = [":go_default_library"],
     deps = [