Add sunrise and anchor tenant discounts to invoicing pipeline

This officially adds a 15% discount to sunrise creates and makes anchor tenant
creates free for the first 2 years.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=204805141

java/google/registry/beam/BUILD

@@ -10,6 +10,7 @@ java_library(
     resources = glob(["sql/*"]),
     deps = [
         "//java/google/registry/config",
+        "//java/google/registry/model",
         "//java/google/registry/reporting/billing",
         "//java/google/registry/util",
         "@com_google_apis_google_api_services_bigquery",