add actual error from query execution to the exception message

[odinuv]

https://keboola.atlassian.net/browse/AJDA-1025

[odinuv]

Release Notes Plans
Minor improvement to error handling in query-api-php-client library. Query failures now return actual SQL error messages instead of generic status codes.

Customer Communication
No direct customer communication needed - this is a library enhancement that improves developer experience. Consuming applications will automatically benefit from more detailed error messages.

Impact Analysis
Low risk change affecting only error message content, not functionality. Developers using this library will receive more actionable error information when queries fail, improving debugging capabilities.

Change Type
Bug fix/improvement - Enhanced error handling to expose actual SQL errors instead of generic "Query job failed with status: failed" messages.

Justification
Addresses AJDA-1025 under the "Augustus Secundus" epic. Current error messages provide insufficient detail for debugging failed queries, making troubleshooting difficult for developers.

Deployment Plan
Standard library release process - tag new version, publish to package manager. No deployment coordination required as this is a PHP library dependency.

Rollback Plan
Revert to previous version via composer if issues arise. Change is backward compatible and only affects error message content, not API contracts.

Post Release
Monitor error logs to ensure new error extraction logic works correctly. Verify consuming applications receive improved error details without breaking changes.

Support Plan
Update internal documentation to reference enhanced error reporting. No additional support overhead expected - change should reduce support burden by providing clearer error context.

[ondrajodas]

jo dobrý 👍