skip dropping if estimation mode #142

Job	Run time
linux-64-py3.10	5m 12s
macOS	11m 27s
develop-docbuild	0s
prototype_mtc	47m 23s
win-64	13m 45s
estimation_mode_test	16m 5s
prototype_arc	50m 34s
placeholder_psrc	48m 7s
prototype_mtc	49m 6s
random_seed_generation_test	2m 24s
prototype_marin	1m 32s
prototype_psrc_in_development	10m 55s
prototype_mtc_extended	2h 20m 51s
placeholder_sandag	2h 10m 29s
prototype_sandag_xborder	5m 6s
production_semcog	5m 29s
prototype_mwcog	44m 53s
placeholder_multiple_zone	7m 52s
	9h 51m 10s

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