feat: Add evaluation batch submission functionality

[vprashrex]

• Introduced run_evaluation_batch_submission task to handle evaluation batch submissions.
• Created start_evaluation_batch_submission utility to enqueue evaluation tasks.
• Updated start_evaluation to utilize the new Celery task for batch submissions.
• Enhanced error handling in evaluation run creation and processing.
• Added support for Google Gemini in evaluation batch processing.
• Refactored model configuration to support multiple providers and completion types.
• Improved logging for better traceability during evaluation processes.
• Updated tests to reflect changes in evaluation batch submission logic.

Summary

Target issue is #PLEASE_TYPE_ISSUE_NUMBER
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• Ran fastapi run --reload app/main.py or docker compose up in the repository root and test.
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