feat: Batch & Batch details creation for the unmatched records.

[saifrazabc]

Description

This is a draft PR for handling unmatched records from the Weekly Response file.

Changes

1. Existing Batch Handling

• Check whether the contact belongs to an existing batch.
• If found:
  • Update the CSA status.
  • Sync updates back to ICM.

2. New Batch Creation

• If no matching batch is found:
  • Check if the contact exists.
  • If the contact exists (i.e., new record from CRA):
    • Create a new batch and corresponding batch details.
    • Update the CSA status.
    • Sync updates back to ICM.

3. Data Integrity

• Ensure batch status and batch detail records are updated correctly.

4. Unmatched Contacts

• If no matching contact is found:
  • Currently skipped.
  • Planned: Store these records in a job table for further investigation (to be implemented in a subsequent PR).