Publish sandbox on x as a standalone JAR (#12386)

Checked with @tudor-da that pkvutils does not rely on this being
available as a thin library.

changelog_begin
changelog_end

ledger/sandbox-on-x/BUILD.bazel

@@ -102,7 +102,6 @@ da_scala_library(
     resources = glob(["src/app/resources/**/*"]),
     scala_deps = [
     ],
-    tags = ["maven_coordinates=com.daml:sandbox-on-x-app:__VERSION__"],
     visibility = ["//visibility:public"],
     deps = [
         ":sandbox-on-x",
@@ -115,6 +114,11 @@ da_scala_library(
 da_scala_binary(
     name = "app",
     main_class = "com.daml.ledger.sandbox.Main",
+    tags = [
+        "fat_jar",
+        "maven_coordinates=com.daml:sandbox-on-x-app:__VERSION__",
+        "no_scala_version_suffix",
+    ],
     visibility = ["//visibility:public"],
     runtime_deps = [
         "@maven//:ch_qos_logback_logback_classic",

release/artifacts.yaml

@@ -163,8 +163,8 @@
   type: jar-scala
 - target: //ledger/sandbox-on-x:sandbox-on-x
   type: jar-scala
-- target: //ledger/sandbox-on-x:sandbox-on-x-app
-  type: jar-scala
+- target: //ledger/sandbox-on-x:app
+  type: jar-deploy
 - target: //ledger/test-common:dar-files-1.14-lib
   type: jar-scala
 - target: //ledger/test-common:dar-files-1.dev-lib