Symlink data directories into build directories #1679

Job	Run time
test_bmi_c (ubuntu-latest)	3m 18s
test_bmi_cpp (ubuntu-latest)	2m 41s
test_bmi_c (macos-latest)	4m 35s
test_bmi_fortran (ubuntu-latest)	3m 20s
test_bmi_cpp (macos-latest)	3m 49s
test_bmi_fortran (macos-latest)	6m 41s
test_bmi_multi (ubuntu-latest)	4m 2s
test_bmi_python (ubuntu-latest)	3m 55s
test_bmi_multi (macos-latest)	4m 51s
test_mpi_remote_nexus (ubuntu-latest)	1m 23s
test_bmi_python (macos-latest)	7m 36s
test_pet (ubuntu-latest)	3m 8s
test_unit (ubuntu-latest)	4m 43s
test_pet (macos-latest)	7m 7s
test_unit (macos-latest)	10m 23s
	1h 11m 32s

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