feat: promote to 1.0.0 (#38)

Release-As: 1.0.0

.repo-metadata.json

@@ -4,7 +4,7 @@
   "product_documentation": "https://cloud.google.com/service-infrastructure/docs/overview/",
   "api_description": "is a foundational platform for creating, managing, securing, and consuming APIs and services across organizations. It is used by Google APIs, Cloud APIs, Cloud Endpoints, and API Gateway. Service Infrastructure provides a wide range of features to service consumers and service producers, including authentication, authorization, auditing, rate limiting, analytics, billing, logging, and monitoring.",
   "client_documentation": "https://googleapis.dev/java/google-cloud-service-management/latest/index.html",
-  "release_level": "beta",
+  "release_level": "ga",
   "transport": "grpc",
   "language": "java",
   "repo": "googleapis/java-service-management",