Make essential Bazel packages publicly visible

This allows separate Bazel projects to reference Nomulus as an external
repository. They can then copy the []
directory structure into their own project and customize the Action
and Module lists for the GAE modules in their own deployment.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=136863886

java/google/registry/ui/BUILD

@@ -69,6 +69,7 @@ zip_file(
 java_library(
     name = "ui",
     srcs = glob(["*.java"]),
+    visibility = ["//visibility:public"],
     deps = [
         "//java/com/google/common/base",
         "//third_party/java/appengine:appengine-api",

java/google/registry/ui/forms/BUILD

@@ -1,5 +1,5 @@
 package(
-    default_visibility = ["//java/google/registry:registry_project"],
+    default_visibility = ["//visibility:public"],
 )
 
 licenses(["notice"])  # Apache 2.0
@@ -8,7 +8,6 @@ licenses(["notice"])  # Apache 2.0
 java_library(
     name = "forms",
     srcs = glob(["*.java"]),
-    visibility = ["//visibility:public"],
     deps = [
         "//java/com/google/common/annotations",
         "//java/com/google/common/base",

java/google/registry/ui/server/registrar/BUILD

@@ -1,5 +1,5 @@
 package(
-    default_visibility = ["//java/google/registry:registry_project"],
+    default_visibility = ["//visibility:public"],
 )
 
 licenses(["notice"])  # Apache 2.0
@@ -12,7 +12,6 @@ java_library(
         "//java/google/registry/ui/css:registrar_bin.css.js",
         "//java/google/registry/ui/css:registrar_dbg.css.js",
     ],
-    visibility = ["//visibility:public"],
     deps = [
         "//java/com/google/common/annotations",
         "//java/com/google/common/base",