DM-27833: Enable gen3 inter-chip crosstalk for DECam

[czwa]

Add updated two-part crosstalk ISR pipeline definitions.

[mrawls]

These additions appear necessary, but leave me confused as to how to run IsrTask with DECam and doCrosstalk: True. Let's say I'm trying to run DRP.yaml and I'm attempting to follow best practices by using the obs_package pipeline (which imports from pipe_tasks as appropriate). Right now, obs_decam does have its own DRP.yaml, but it doesn't import any the DECam ISR pipelines. I think I understand that I need to do two pipetask run calls now, but that needs to be much clearer from the pipeline yaml files themselves, please.

[mrawls]

Thank you! Is it feasible to also edit the (newer than when you started this, I am now realizing 😬 ) DRP.yaml to use the correct DECam ISR pipeline, perhaps with a comment explaining the recommended precursor step?

[czwa]

I've updated the DRP.yaml to point at the correct ISR configuration, as well as a comment block that should explain what is required to generate the crosstalk sources.

[mrawls]

Thank you - it's all much clearer now!