build

acc: Introduce phases; speed up "test-update" 2x. #23979

Job	Run time
testmask	25s
cleanups	3s
integration-trigger-dependabot	-1s
validate-generated-is-up-to-date	44s
validate-python-codegen	12s
integration-trigger	16s
make test (linux, direct)	6m 15s
make test (macos, direct)	31m 19s
make test (macos, terraform)	31m 37s
make test (windows, direct)	9m 32s
make test (windows, terraform)	19m 12s
make test (linux, terraform)	12m 18s
make test-exp-ssh	0s
make test-exp-aitools	0s
make test-pipelines	0s
test-result	2s
	1h 51m 54s

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