System Nexus payload handling from WIT #5502

Job	Run time
check-protos	9m 35s
build-lint-test (3.10, macos-arm)	4m 50s
features-tests / test	9m 5s
build-lint-test (3.10, ubuntu-arm)	5m 34s
build-lint-test (3.10, windows-latest)	6m 47s
build-lint-test (3.14, ubuntu-latest)	5m 16s
build-lint-test (3.10, ubuntu-latest)	4m 12s
build-lint-test (3.14, macos-arm)	6m 31s
test-latest-deps	4m 32s
build-lint-test (3.14, windows-latest)	7m 56s
build-lint-test (3.14, ubuntu-arm)	5m 37s
cloud-test	3m 30s
	1h 13m 25s

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