fix: refactor internal `AshGraphql.Resource.mutation_fields/5` (#311) #1466

Job	Run time
ash-ci / audit	49s
ash-ci / Report Mix Dependencies	9s
ash-ci / MIX_ENV=test mix.compile	1m 21s
ash-ci / mix igniter.upgrade	5s
ash-ci / mix spark.formatter --check	1m 26s
ash-ci / mix format --check-formatted	1m 14s
ash-ci / mix deps.unlock --check-unused	1m 23s
ash-ci / mix test	1m 51s
ash-ci / mix credo --strict	1m 16s
ash-ci / mix dialyzer	4m 4s
ash-ci / mix spark.cheat_sheets --check	2m 28s
ash-ci / mix sobelow	1m 26s
ash-ci / MIX_ENV=dev mix.compile	27s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix docs	2m 17s
ash-ci / NIF ${{ matrix.nif }} - ${{ matrix.job.target }} (${{ matrix.job.os }})	0s
ash-ci / Release	-1s
ash-ci / Deploy docs to GitHub pages.	10s
	20m 25s

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