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docs: document builder integration test targets in AGENTS.md #4574

Job	Run time
list	29s
workflow (build-cli)	1m 43s
workflow (devkit-core-tests)	1m 28s
workflow (build-unit-tests)	2m 33s
workflow (modules-builder-tests)	1m 49s
workflow (devkit-core-tests-rerun)	1m 58s
	10m 0s