improvement: only compile on uncompiled extension in formatter #1303

Job	Run time
ash-ci / audit	48s
ash-ci / Report Mix Dependencies	11s
ash-ci / Community Files Check	3s
ash-ci / MIX_ENV=test mix.compile	39s
ash-ci / mix igniter.upgrade	4s
ash-ci / REUSE compliance	15s
ash-ci / mix format --check-formatted	26s
ash-ci / mix sobelow	32s
ash-ci / mix test	1m 20s
ash-ci / mix deps.unlock --check-unused	26s
ash-ci / mix spark.formatter --check	6s
ash-ci / mix credo --strict	56s
ash-ci / mix spark.cheat_sheets --check	56s
ash-ci / mix dialyzer	2m 52s
ash-ci / MIX_ENV=dev mix.compile	30s
ash-ci / mix doctor --full --raise	0s
ash-ci / mix git_ops.check_message	0s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix docs	1m 12s
ash-ci / Deploy docs to GitHub pages.	11s
ash-ci / NIF ${{ matrix.nif }} - ${{ matrix.job.target }} (${{ matrix.job.os }})	0s
ash-ci / Release	0s
	11m 27s

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