feat: support `UniverseDomainOption` in gRPC IAM stub #3227

Job	Run time
Require Approval for External PRs	1s
macOS-Bazel	0s
Windows-Bazel	0s
External Account Integration / external-account-integration-test	1m 36s
macOS-CMake / cmake + macos-13 + Core	9m 18s
Windows-CMake / cmake + msvc-2022 + x64 + Debug + Core	6m 23s
Windows-CMake / cmake + msvc-2022 + x64 + Release + Core	9m 5s
Windows-CMake / cmake + msvc-2022 + x86 + Release + Core	9m 3s
	35m 26s

Provide feedback