[New Feature]: Remove R3 DISP-S1 historical logic from batch_process lambda

[philipjyoon]

Checked for duplicates

Yes - I've already checked

Alternatives considered

Yes - and alternatives don't suffice

Related problems

No response

Describe the feature request

R3 DISP-S1 historical processing is now executed by a stand-alone CLI application as opposed to the batch_process lambda. batch_process lambda should now revert back to a state before the R3 logic was introduced:

1. Cleaner, easier maintenance, etc
2. The extra R3 code could trigger an edge-case bug in future. No reason to keep it around
3. That R3 code doesn't work anyway because the historical processing logic has changed significantly after it was written