m/installer/install: move from osbase/build/mkimage/osimage

Move the package osbase/build/mkimage/osimage to
metropolis/installer/install. The package contains "metropolis" in
various strings, so it fits better in //metropolis than in //osbase.
The parent package mkimage no longer exists.

The rename also removes the name clash with osbase/oci/osimage.

Change-Id: Ia228ab94c937f4c7a5b6eb1fcc77993a594d64b6
Reviewed-on: https://review.monogon.dev/c/monogon/+/4296
Tested-by: Jenkins CI
Reviewed-by: Tim Windelschmidt <tim@monogon.tech>
diff --git a/metropolis/test/launch/BUILD.bazel b/metropolis/test/launch/BUILD.bazel
index bbe3eb9..6c76d5b 100644
--- a/metropolis/test/launch/BUILD.bazel
+++ b/metropolis/test/launch/BUILD.bazel
@@ -44,6 +44,7 @@
     deps = [
         "//go/logging",
         "//metropolis/cli/metroctl/core",
+        "//metropolis/installer/install",
         "//metropolis/node",
         "//metropolis/node/core/curator/proto/api",
         "//metropolis/node/core/rpc",
@@ -51,7 +52,6 @@
         "//metropolis/proto/api",
         "//metropolis/proto/common",
         "//osbase/blockdev",
-        "//osbase/build/mkimage/osimage",
         "//osbase/logbuffer",
         "//osbase/oci",
         "//osbase/oci/osimage",