Evaluation: Fix TTS processing issue

[AkhileshNegi]

Describe the bug
The TTS evaluation process remains stuck in "processing" status indefinitely. This prevents users from accessing evaluation results, leading to frustration and inefficiencies.

To Reproduce
Steps to reproduce the behavior:

1. Go to Text-to-Speech in Evaluation
2. Create a dataset
3. Go to evaluation tab
4. Add details and run evaluation
5. Check evaluation and it stays in same status after hrs

Expected behavior

• Fix the TTS evaluation process to ensure it completes and updates status correctly.
• Ensure that once the batch is completed, users can view the results.

Screenshots