Fix structs, maps and typedstructs becoming orphans if only referenced in unions #1621

Job	Run time
ash-ci / audit	57s
ash-ci / Community Files Check	4s
ash-ci / MIX_ENV=test mix.compile	1m 30s
ash-ci / mix igniter.upgrade	6s
ash-ci / Report Mix Dependencies	-1s
ash-ci / mix test	1m 53s
ash-ci / mix spark.cheat_sheets --check	2m 38s
ash-ci / mix credo --strict	2m 7s
ash-ci / mix format --check-formatted	1m 24s
ash-ci / mix deps.unlock --check-unused	1m 19s
ash-ci / mix spark.formatter --check	1m 25s
ash-ci / mix sobelow	1m 23s
ash-ci / mix doctor --full --raise	0s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix git_ops.check_message	0s
ash-ci / MIX_ENV=dev mix.compile	28s
ash-ci / mix dialyzer	4m 20s
ash-ci / mix docs	2m 32s
ash-ci / NIF ${{ matrix.nif }} - ${{ matrix.job.target }} (${{ matrix.job.os }})	-1s
ash-ci / Release	-1s
ash-ci / Deploy docs to GitHub pages.	0s
	22m 3s

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