[BUG] Refactor send_file_and_cleanup() for Improved Maintainability

[durdana3105]

Description

The send_file_and_cleanup() function currently handles multiple input types and cleanup logic within a single method. Refactoring the implementation into smaller helper functions will improve readability, maintainability, and future extensibility.

File: utils/file_utils.py

Tasks

• Split handling of file paths, byte streams, and file-like objects into helper functions
• Reduce nested conditional logic
• Remove duplicated response handling code
• Preserve existing functionality and API compatibility
• Add or update inline documentation where appropriate

Acceptance Criteria

• Function complexity is reduced
• Existing behavior remains unchanged
• Code is easier to maintain
• Documentation/comments are updated
• All existing tests continue to pass

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Please assign this issue to me under GSSoC.