remove `_legacy_copy_params` from `add_transform` #3599

Job	Run time
check-package / init-store	7s
check-schema / schema	15s
precommit-run / pre-commit	43s
check-package / pkg-build (ubuntu-latest)	23s
check-package / pkg-check (ubuntu-latest, 3.10)	2m 57s
check-package / pkg-check (ubuntu-latest, 3.11)	2m 31s
check-package / pkg-check (macOS-latest, 3.10)	54s
check-package / pkg-check (macOS-latest, 3.11)	1m 8s
check-package / pkg-check (windows-latest, 3.10)	4m 16s
check-package / pkg-check (windows-latest, 3.11)	3m 36s
check-package / pkg-guardian	1s
	16m 51s

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