Option to skip baseline variant sim_data

[thalassemia]

This is most useful when running many batches of simulations using the same variant function. In these cases, the baseline lineage(s) will always lead to the same simulation outputs (wasted computation).

[github-actions[bot]]

Package	Line Rate	Complexity	Health
.	31%	0	❌
analysis	100%	0	✔
analysis.antibiotics_colony	11%	0	❌
analysis.antibiotics_colony.subgen_gene_plots	20%	0	❌
analysis.causality_network	18%	0	❌
analysis.colony	11%	0	❌
analysis.multidaughter	100%	0	✔
analysis.multiexperiment	100%	0	✔
analysis.multigeneration	23%	0	❌
analysis.multiseed	17%	0	❌
analysis.multivariant	17%	0	❌
analysis.single	15%	0	❌
composites	34%	0	❌
composites.ecoli_configs	90%	0	✔
composites.environment	26%	0	❌
debug	17%	0	❌
ecoli	9%	0	❌
ecoli.compendium	18%	0	❌
ecoli.dataclasses	31%	0	❌
ecoli.dataclasses.process	22%	0	❌
ecoli.dataclasses.state	32%	0	❌
ecoli.scripts	43%	0	❌
ecoli.scripts.fold_changes	15%	0	❌
ecoli.scripts.metabolism_kinetics	36%	0	❌
ecoli.scripts.metabolite_concentrations	26%	0	❌
ecoli.scripts.nca	10%	0	❌
ecoli.scripts.protein_half_lives	29%	0	❌
ecoli.scripts.rna_half_lives	21%	0	❌
experiments	36%	0	❌
io	52%	0	➖
library	48%	0	❌
library.cell_wall	14%	0	❌
processes	43%	0	❌
processes.antibiotics	27%	0	❌
processes.chemotaxis	14%	0	❌
processes.environment	29%	0	❌
processes.listeners	78%	0	✔
processes.membrane	27%	0	❌
processes.spatiality	19%	0	❌
processes.stubs	45%	0	❌
tests	22%	0	❌
tests.io	24%	0	❌
tests.utils	25%	0	❌
utils	28%	0	❌
utils._netflow	45%	0	❌
variants	36%	0	❌
Summary	28% (8430 / 29920)	0	❌