Move policies to crate root

Author: linus-mullvad

…ies/sigsum-generic-2025-1.builtin-policy …ies/sigsum-generic-2025-1.builtin-policysrc/policy/builtin-policies/sigsum-generic-2025-1.builtin-policy renamed to builtin-policies/sigsum-generic-2025-1.builtin-policy src/policy/builtin-policies/sigsum-generic-2025-1.builtin-policy renamed to builtin-policies/sigsum-generic-2025-1.builtin-policy

@@ -49,7 +49,7 @@ macro_rules! define_builtin_policies {
                 name: $policy_name,
                 policy: LazyLock::new(|| {
                     Policy::parse(include_str!(concat!(
-                        "builtin-policies/",
+                        "../../builtin-policies/",
                         $policy_name,
                         ".builtin-policy"
                     )))