batch:repl fix copy from source -> remote

[poornas]

completes fix started by #20365

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Description

Motivation and Context

How to test this PR?

replicate:
  apiVersion: v1
  # source of the objects to be replicated
  source:
    type: minio # valid values are "minio"
    bucket: bucket
    prefix: #""  # 'PREFIX' is optional
  # target where the objects must be replicated
  target:
    type: s3 
    bucket: bucket
    prefix: staging # 'PREFIX' is optional
    # NOTE: if target is remote then source must be "local"
    endpoint: http://localhost:9004
    credentials:
      accessKey: minioadmin
      secretKey: minioadmin

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here) feat: support batch replication prefix slice #20033
• Unit tests added/updated
• Internal documentation updated
• Create a documentation update request here