remove deprecated LEGACY_PATH support. #356

Job	Run time
cwltest release test	1m 6s
CI linters via Tox (lintreadme)	28s
CI tests via Tox (3, 8, lint)	15s
CI linters via Tox (pydocstyle)	17s
CI tests via Tox (3, 8, unit)	50s
CI tests via Tox (3, 8, mypy)	36s
CI tests via Tox (3, 8, bandit)	13s
CI tests via Tox (3, 9, lint)	15s
CI tests via Tox (3, 9, unit)	31s
CI tests via Tox (3, 9, mypy)	24s
CI tests via Tox (3, 9, bandit)	18s
CI tests via Tox (3, 10, lint)	18s
CI tests via Tox (3, 10, unit)	50s
CI tests via Tox (3, 10, mypy)	47s
CI tests via Tox (3, 10, bandit)	14s
CI tests via Tox (3, 11, lint)	13s
CI tests via Tox (3, 11, unit)	51s
CI tests via Tox (3, 11, mypy)	35s
CI tests via Tox (3, 11, bandit)	11s
CI tests via Tox (3, 12, lint)	18s
CI tests via Tox (3, 12, unit)	48s
CI tests via Tox (3, 12, mypy)	50s
CI tests via Tox (3, 12, bandit)	19s
	11m 27s

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