fix(@angular/build): add timestamp to bundle generation log #8635

Job	Run time
lint	20s
build	20s
build-e2e-windows	24s
test	1s
Browser Compatibility Tests	1s
publish-snapshots	1s
e2e-snapshots	1s
e2e-package-managers	1s
e2e	1s
e2e-windows	1s
	1m 11s

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