improvement: remove warnings about `Phx.New` in some new projects #906

Job	Run time
ash-ci / mix deps.get	13s
ash-ci / mix igniter.upgrade	0s
ash-ci / audit	31s
ash-ci / MIX_ENV=test mix.compile	25s
ash-ci / mix docs	55s
ash-ci / mix credo --strict	3s
ash-ci / mix ash.codegen --check	0s
ash-ci / MIX_ENV=dev mix.compile	20s
ash-ci / mix dialyzer	2m 33s
ash-ci / mix format --check-formatted	19s
ash-ci / mix sobelow	4s
ash-ci / mix spark.cheat_sheets --check	4s
ash-ci / mix spark.formatter --check	6s
ash-ci / mix test	2m 7s
ash-ci / mix deps.unlock --check-unused	27s
ash-ci / Deploy docs to GitHub pages.	9s
ash-ci / NIF ${{ matrix.nif }} - ${{ matrix.job.target }} (${{ matrix.job.os }})	0s
ash-ci / Release	0s
	8m 16s

Provide feedback