Skip nesting coefficient evaluation when evaluating logsums using MNL models #826

Job	Run time
linux-64-py3.10	6m 26s
estimation_mode_test	17m 57s
macOS	2m 46s
develop-docbuild	0s
win-64	2m 28s
prototype_mtc	49m 32s
Standard 1-Zone Example (MTC)	52m 20s
placeholder_psrc	41m 44s
Standard 2-Zone Example (SANDAG)	1h 8m 3s
prototype_marin	2m 56s
random_seed_generation_test	3m 53s
prototype_mtc_extended	1h 26m 0s
placeholder_sandag	1h 43m 53s
prototype_sandag_xborder	5m 51s
production_semcog	6m 28s
prototype_mwcog	48m 57s
placeholder_multiple_zone	9m 14s
	8h 28m 28s

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