Bugfix: Resolved question rewriting pipeline issues

[patrickfleith]

Fix Question Rewriting Pipeline Issues

Relates to #178

1. Type Error in inference calls

• Fixed "sequence item 0: expected str instance, list found" error
• As I understand, STAGE_TAG is already ["question_rewriting"], so wrapping it created invalid nested structure.

After the fix I ran the question_rewriting pipeline and found other issues.

2. Missing required field validation

• Fixed QuestionRow validation errors for existing datasets
• The question_mode is not part of the to_dict() arguments (we don't save it as part of the dataset). So it triggers a validation error when building QuestionRow with the question_rewriting pipeline. The fix is to use a default value to pass validation. The question_mode is anyway not saved in the new _questions_rewritten subset

3. Missing subset error

• Added graceful handling when multi_hop_questions subset doesn't exist

Result
Question Rewriting pipeline should now work again.

Please test and let me know if I missed something or if I should follow a different approach to fix this.

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[sumukshashidhar]

hi @patrickfleith , could you just reformat with ruff so it passes the codeql? thanks!