Initial part of adding nullability annotations to C++ generated code #72899

Annotations

8 warnings

Overwriting existing environment variable CLOUDSDK_AUTH_CREDENTIAL_FILE_OVERRIDE (was: "D:\\a\\protobuf\\protobuf\\gha-creds-8276adbd5ff4858f.json")

Overwriting existing environment variable GOOGLE_APPLICATION_CREDENTIALS (was: "D:\\a\\protobuf\\protobuf\\gha-creds-8276adbd5ff4858f.json")

Overwriting existing environment variable GOOGLE_GHA_CREDS_PATH (was: "D:\\a\\protobuf\\protobuf\\gha-creds-8276adbd5ff4858f.json")

Overwriting existing environment variable CLOUDSDK_CORE_PROJECT (was: "protobuf-build")

Overwriting existing environment variable CLOUDSDK_PROJECT (was: "protobuf-build")

Overwriting existing environment variable GCLOUD_PROJECT (was: "protobuf-build")

Overwriting existing environment variable GCP_PROJECT (was: "protobuf-build")

Overwriting existing environment variable GOOGLE_CLOUD_PROJECT (was: "protobuf-build")