build

acc: Introduce phases; speed up "test-update" 2x. #23972

Job	Run time
cleanups	3s
testmask	26s
integration-trigger-dependabot	-1s
validate-python-codegen	14s
validate-generated-is-up-to-date	1m 12s
integration-trigger	13s
make test (windows, terraform)	22m 42s
make test (windows, direct)	15m 42s
make test (macos, terraform)	32m 50s
make test (macos, direct)	32m 14s
make test (linux, terraform)	13m 10s
make test (linux, direct)	7m 4s
make test-exp-aitools	0s
make test-pipelines	0s
make test-exp-ssh	0s
test-result	2s
	2h 5m 51s

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