fix(riverpod_lint): correctly detects nested ref invocations #5632

Job	Run time
build (stable, examples/counter)	1m 16s
build (stable, examples/marvel)	49s
build (stable, examples/pub)	42s
build (stable, examples/random_number)	42s
build (stable, examples/stackoverflow)	47s
build (stable, examples/todos)	1m 20s
build (stable, packages/riverpod)	2m 1s
build (stable, packages/riverpod/example)	43s
build (stable, packages/flutter_riverpod)	1m 28s
build (stable, packages/flutter_riverpod/example)	1m 13s
build (stable, packages/hooks_riverpod)	1m 21s
build (stable, packages/hooks_riverpod/example)	1m 18s
build (stable, packages/riverpod_annotation)	47s
build (stable, packages/riverpod_generator)	1m 36s
build (stable, packages/riverpod_generator/integration/build_yaml)	1m 32s
build (stable, website)	49s
build (master, examples/counter)	1m 39s
build (master, examples/marvel)	1m 3s
build (master, examples/pub)	1m 9s
build (master, examples/random_number)	1m 3s
build (master, examples/stackoverflow)	1m 2s
build (master, examples/todos)	1m 36s
build (master, packages/riverpod)	2m 14s
build (master, packages/riverpod/example)	51s
build (master, packages/flutter_riverpod)	1m 48s
build (master, packages/flutter_riverpod/example)	1m 34s
build (master, packages/hooks_riverpod)	1m 35s
build (master, packages/hooks_riverpod/example)	1m 32s
build (master, packages/riverpod_annotation)	49s
build (master, packages/riverpod_generator)	2m 0s
build (master, packages/riverpod_generator/integration/build_yaml)	1m 43s
build (master, website)	1m 4s
	41m 6s

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