Add SAA TemporalNexusOperation handling #5414

Job	Run time
test-latest-deps	10m 47s
cloud-test	2m 8s
check-protos	8m 23s
build-lint-test (3.10, ubuntu-latest)	14m 52s
build-lint-test (3.10, windows-latest)	20m 20s
features-tests / test	7m 17s
build-lint-test (3.14, macos-arm)	7m 53s
build-lint-test (3.14, ubuntu-arm)	12m 1s
build-lint-test (3.14, windows-latest)	18m 48s
build-lint-test (3.10, ubuntu-arm)	11m 50s
build-lint-test (3.14, ubuntu-latest)	19m 8s
build-lint-test (3.10, macos-arm)	10m 1s
	2h 23m 28s

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