fix: don't include related fields in managed relationship inputs #756

Job	Run time
ash-ci / mix deps.get	27s
ash-ci / mix hex.audit	26s
ash-ci / MIX_ENV=dev mix.compile	31s
ash-ci / MIX_ENV=test mix.compile	53s
ash-ci / mix sobelow	49s
ash-ci / mix format --check-formatted	48s
ash-ci / mix dialyzer	5m 47s
ash-ci / mix credo --strict	57s
ash-ci / mix spark.cheat_sheets --check	52s
ash-ci / mix spark.formatter --check	1m 0s
ash-ci / mix test	1m 31s
ash-ci / mix deps.unlock --check-unused	47s
ash-ci / Release	0s
	14m 48s

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