improvement: properly return nested errors with `for_path: :all` #678

Job	Run time
ash-ci / mix deps.get	22s
ash-ci / MIX_ENV=dev mix.compile	34s
ash-ci / MIX_ENV=test mix.compile	34s
ash-ci / mix hex.audit	24s
ash-ci / mix spark.formatter --check	4s
ash-ci / mix sobelow	31s
ash-ci / mix format --check-formatted	33s
ash-ci / mix spark.cheat_sheets --check	32s
ash-ci / mix credo --strict	4s
ash-ci / mix dialyzer	4m 14s
ash-ci / mix test	1m 10s
ash-ci / mix deps.unlock --check-unused	30s
ash-ci / Release	0s
	9m 32s

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