Less restrictive `promote_u0_p` #6861

Job	Run time
SciMLBase.jl/Downstream/1	53m 18s
NeuralPDE.jl/NNPDE/1	24m 54s
DataDrivenDiffEq.jl/Downstream/1	15m 50s
CellMLToolkit.jl/Core/1	17m 50s
StructuralIdentifiability.jl/Core/1	23m 9s
ModelingToolkitStandardLibrary.jl/Core/1	40m 19s
SBMLToolkit.jl/All/1	57m 0s
Catalyst.jl/All/1	1h 32m 54s
ModelOrderReduction.jl/All/1	42s
MethodOfLines.jl/Interface/1	20m 54s
MethodOfLines.jl/DAE/1	22m 53s
MethodOfLines.jl/2D_Diffusion/1	27m 17s
Neuroblox.jl/All/1	38s
ModelingToolkitNeuralNets.jl/All/1	52m 1s
	7h 29m 39s

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