Move UpgradesCheckSpec back to the daml repo (#22629)

Companion PR: DACH-NY/canton#30210

This test is an integration test for `UpgradeCheckMain`, itself part of
the daml repo. It uses dars generated by the daml repo and not visible
by the canton repo.

This move means that the upgrade check won't be tested in the canton
repo, despite most of the check's code being hosted in the canton repo.
So I'll open a canton ticket to create a companion unit test that
doesn't use dars but LF packages generated using the LF syntax instead.
In the meantime, whenever we find a bug in the check, we'll add a
non-regression test to the canton repo.

I'll port the changes under `canton/...` in this PR to the canton repo.

Author: paulbrauner-da

sdk/canton/BUILD.bazel

@@ -264,7 +264,7 @@ da_scala_library(
     tags = ["maven_coordinates=com.daml:base-grpc-utils:__VERSION__"],
     unused_dependency_checker_mode = "error",
     visibility = [
-        "//canton/community/daml-lf/validation:__subpackages__",
+        "//daml-assistant/upgrade-check-main:__subpackages__",
         "//daml-script:__subpackages__",
         "//test-common/canton:__subpackages__",
     ],
@@ -414,7 +414,7 @@ proto_gen(
         "grpc",
     ],
     visibility = [
-        "//canton/community/daml-lf/validation:__subpackages__",
+        "//daml-assistant/upgrade-check-main:__subpackages__",
         "//daml-script:__subpackages__",
     ],
 )
@@ -437,7 +437,7 @@ da_scala_library(
         ]
     ],
     tags = ["maven_coordinates=com.daml:community-admin-api:__VERSION__"],
-    visibility = ["//canton/community/daml-lf/validation:__subpackages__"],
+    visibility = ["//daml-assistant/upgrade-check-main:__subpackages__"],
 )
 
 ### community/base ###

sdk/canton/community/daml-lf/parser/BUILD.bazel

@@ -20,6 +20,7 @@ da_scala_library(
     tags = ["maven_coordinates=com.daml:daml-lf-parser:__VERSION__"],
     visibility = [
         "//canton/community/daml-lf:__subpackages__",
+        "//daml-assistant/upgrade-check-main:__subpackages__",
     ],
     deps = [
         "//canton:scala-utils",