fix: remove system added error vars to ensure deduplication works pro… #691

Job	Run time
ash-ci / mix deps.get	22s
ash-ci / MIX_ENV=test mix.compile	36s
ash-ci / mix hex.audit	23s
ash-ci / MIX_ENV=dev mix.compile	38s
ash-ci / mix sobelow	38s
ash-ci / mix spark.formatter --check	6s
ash-ci / mix format --check-formatted	28s
ash-ci / mix spark.cheat_sheets --check	30s
ash-ci / mix dialyzer	4m 14s
ash-ci / mix credo --strict	5s
ash-ci / mix test	55s
ash-ci / mix deps.unlock --check-unused	28s
ash-ci / Release	0s
	9m 23s

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