use get_vars_from_components rather than identify_variables_in_compon… #666

Job	Run time
linux/3.8/bare-env	9s
lint/style-and-typos	37s
linux/3.12	15m 48s
osx/3.10	25m 11s
win/3.9	42m 35s
linux/3.11/conda	20m 19s
linux/3.10/mpi	8m 8s
linux/3.10/cython	20m 31s
win/3.8/pip	27m 48s
process-coverage-${{ matrix.TARGET }}	0s
	2h 41m 6s

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