refactored inference handler to pull infer_variant into separate fn

[virajmehta]

Important

Refactor inference handling by extracting variant-specific logic into separate functions for improved code clarity.

• Refactoring:
  • Extracts start_variant_batch_inference from start_batch_inference in batch_inference.rs.
  • Extracts infer_variant from inference in inference.rs.
• Functions:
  • start_variant_batch_inference handles variant-specific batch inference logic.
  • infer_variant handles variant-specific inference logic.
• Behavior:
  • No changes to external behavior; refactoring is internal for code clarity.

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