WFSS contamination modelling for saturated pixels in direct imaging

[stscijirahub]

Issue JP-4203 was created on JIRA by Gael Noirot:

The wfss contam step models the spectra based on the pixel-level flux of each source in the direct imaging. Saturated pixels in the direct imaging are therefore not adequately normalized in the models. This likely contributes to the non-negligible residuals seen in the core of the traces for bright objects (see plot). This ticket is to discuss how to treat such saturated pixels in the direct imaging during the wfss contam step.