Add per-line errors for batch evaluation

[salma-elshafey]

Description

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• The pull request does not introduce [breaking changes]
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[Copilot]

Pull request overview

This PR adds support for reporting batch-evaluation failures as per-row errors when converting results into the AOAI evaluation-results format, preventing successful rows from being stamped with unrelated batch-level errors.

Changes:

• Pass row_idx into _add_error_summaries so error stamping can be row-aware.
• Extend _add_error_summaries to prefer per_line_errors[row_idx] (and skip stamping when the row has no per-line error).
• Add collection of per_line_errors in the batch run submitter’s get_run_summary().

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluate/_evaluate.py	Makes error summary generation row-aware and consumes optional per-line errors.
sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluate/_batch_run/_run_submitter_client.py	Adds per-line error extraction from batch run details into the run summary.