Switch remaining App Engine dependencies to built-at-head targets

Most dependencies on the Old SDK were switched in [] This is just catching up on some OAuth dependencies that remained and some remaining uses of Old build rules.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=226337284

java/google/registry/config/BUILD

@@ -9,7 +9,6 @@ java_library(
     srcs = glob(["*.java"]),
     resources = glob(["files/*.yaml"]),
     deps = [
-        "//java/com/google/api/client/extensions/appengine/auth/oauth2",
         "//java/google/registry/keyring/api",
         "//java/google/registry/util",
         "@com_google_api_client",

java/google/registry/tools/BUILD

@@ -35,7 +35,6 @@ java_library(
         "//java/google/registry/module/tools",
     ],
     deps = [
-        "//java/com/google/api/client/extensions/appengine/auth/oauth2",
         "//java/google/registry/backup",
         "//java/google/registry/beam/invoicing",
         "//java/google/registry/beam/spec11",