Backport to branch(3) : Fix exception handling in the data loader importing to handle the unkown exceptions properly

[feeblefakie]

This is an automated backport of the following:

• Original PR: Fix exception handling in the data loader importing to handle the unkown exceptions properly #3183
• Backported commit: fd37bca

Please merge this PR after all checks have passed.

[gemini-code-assist]

Summary of Changes

Hello @feeblefakie, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request backports critical improvements to the data loader's exception handling mechanism, specifically within the transaction processing logic. The primary goal is to make the data import process more resilient to unexpected runtime errors by ensuring that all exceptions are properly caught, transactions are safely aborted, and comprehensive error information is logged. This enhancement significantly improves the stability and diagnostic capabilities of the data loader.

Highlights

• Enhanced Exception Handling: The data loader's ImportProcessor now includes a new catch block for general Exceptions, ensuring that unexpected runtime errors during transaction processing are caught, logged, and handled gracefully.
• Refactored Transaction Abort Logic: The logic for aborting distributed transactions has been extracted into a dedicated private helper method, abortTransactionSafely, which centralizes and improves the robustness of transaction cleanup, even if the abort itself fails.
• Improved Logging: Error logging for both TransactionException and general Exceptions has been enhanced to provide more contextual information, including transaction batch and data chunk IDs, aiding in quicker debugging.
• New Test Coverage: A new test case has been added to ImportProcessorTest to specifically verify the graceful handling of unexpected exceptions during transaction processing, ensuring the new error handling mechanism works as intended.

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[gemini-code-assist]

Code Review

This pull request is a backport that improves exception handling in the data loader. The changes introduce a catch block for unexpected exceptions during transaction processing, preventing potential crashes. The transaction abort logic has been refactored into a new, safer helper method abortTransactionSafely, which improves code clarity and robustness. The accompanying test validates the fix for handling unexpected exceptions. The changes are well-implemented and enhance the reliability of the data import process. I have one suggestion to further improve test coverage for the new helper method.