build

acc: Introduce phases; speed up "test-update" 2x. (#4795) #23986

Job	Run time
testmask	24s
cleanups	2s
integration-trigger-dependabot	-1s
validate-generated-is-up-to-date	47s
validate-python-codegen	13s
integration-trigger	8s
make test (windows, direct)	10m 54s
make test (linux, terraform)	10m 42s
make test (macos, terraform)	11m 58s
make test (windows, terraform)	18m 21s
make test (linux, direct)	6m 20s
make test (macos, direct)	8m 0s
make test-exp-aitools	0s
make test-pipelines	0s
make test-exp-ssh	-1s
test-result	4s
	1h 7m 51s

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