Delay kernel is improperly defined within LatentDelay

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#250 attempt to solve an issue with handling partial latent delays but did not correctly update the generate kernel function so that it returns only complete convolution kernels.

To resolve this we should add a option so that it can do so. This change also needs to add a robust unit test for LatentDelay.

Rt-without-renewal/EpiAware/src/EpiObsModels/LatentDelay.jl

Line 71 in 4688d20

kernel = generate_observation_kernel(obs_model.pmf, nobs_Y_t)

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This was closed by #267