Verify analyzer target directory exists #4250

Job	Run time
build (stable, examples/counter)	1m 11s
build (stable, examples/marvel)	1m 5s
build (stable, examples/pub)	1m 6s
build (stable, examples/random_number)	1m 13s
build (stable, examples/stackoverflow)	1m 19s
build (stable, examples/todos)	1m 13s
build (stable, packages/riverpod)	3m 5s
build (stable, packages/riverpod/example)	1m 24s
build (stable, packages/flutter_riverpod)	1m 24s
build (stable, packages/flutter_riverpod/example)	1m 5s
build (stable, packages/hooks_riverpod)	1m 11s
build (stable, packages/hooks_riverpod/example)	1m 22s
build (stable, packages/riverpod_annotation)	51s
build (stable, packages/riverpod_generator)	1m 30s
build (stable, packages/riverpod_generator/integration/build_yaml)	1m 40s
build (stable, website)	1m 8s
build (master, examples/counter)	2m 10s
build (master, examples/marvel)	2m 5s
build (master, examples/pub)	1m 32s
build (master, examples/random_number)	2m 1s
build (master, examples/stackoverflow)	1m 31s
build (master, examples/todos)	1m 31s
build (master, packages/riverpod)	3m 4s
build (master, packages/riverpod/example)	1m 47s
build (master, packages/flutter_riverpod)	2m 28s
build (master, packages/flutter_riverpod/example)	1m 29s
build (master, packages/hooks_riverpod)	1m 37s
build (master, packages/hooks_riverpod/example)	1m 29s
build (master, packages/riverpod_annotation)	1m 21s
build (master, packages/riverpod_generator)	2m 35s
build (master, packages/riverpod_generator/integration/build_yaml)	2m 29s
build (master, website)	1m 31s
	52m 27s

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