System Nexus payload handling from WIT #5483

Job	Run time
check-protos	7m 19s
test-latest-deps	11m 7s
cloud-test	2m 14s
build-lint-test (3.10, macos-arm)	12m 31s
build-lint-test (3.10, ubuntu-arm)	12m 12s
build-lint-test (3.14, ubuntu-latest)	20m 9s
build-lint-test (3.10, windows-latest)	28m 58s
features-tests / test	9m 7s
build-lint-test (3.14, ubuntu-arm)	12m 41s
build-lint-test (3.14, windows-latest)	25m 21s
build-lint-test (3.14, macos-arm)	7m 44s
build-lint-test (3.10, ubuntu-latest)	13m 4s
	2h 42m 27s

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