fix: use `Code.ensure_loaded?/1` before checking behaviour implementa… #1264

Job	Run time
ash-ci / Report Mix Dependencies	12s
ash-ci / MIX_ENV=test mix.compile	34s
ash-ci / audit	46s
ash-ci / REUSE compliance	9s
ash-ci / Community Files Check	3s
ash-ci / mix igniter.upgrade	5s
ash-ci / mix format --check-formatted	38s
ash-ci / mix spark.formatter --check	8s
ash-ci / mix spark.cheat_sheets --check	50s
ash-ci / mix deps.unlock --check-unused	36s
ash-ci / mix sobelow	28s
ash-ci / mix test	1m 35s
ash-ci / MIX_ENV=dev mix.compile	30s
ash-ci / mix dialyzer	2m 49s
ash-ci / mix credo --strict	1m 22s
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 docs	1m 15s
ash-ci / Deploy docs to GitHub pages.	9s
ash-ci / NIF ${{ matrix.nif }} - ${{ matrix.job.target }} (${{ matrix.job.os }})	0s
ash-ci / Release	0s
	12m 9s

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