Split excluded and arch packages into "package text file"

Aiming to have the main container build not use rpm-ostree.

Signed-off-by: Colin Walters <walters@verbum.org>

base/bootc.yaml

@@ -9,9 +9,3 @@ packages:
  # Required by bootc install, sgdisk has been replaced by Rust crate
  # in bootc https://github.com/containers/bootc/pull/775
  - xfsprogs e2fsprogs dosfstools
-
-exclude-packages:
-  # Exclude kernel-debug-core to make sure that it doesn't somehow get
-  # chosen as the package to satisfy the `kernel-core` dependency from
-  # the kernel package.
-  - kernel-debug-core