Backport to branch(3) : Fix --no-header option not working for CSV exports

[feeblefakie]

This is an automated backport of the following:

• Original PR: Fix --no-header option not working for CSV exports #2924
• Backported commit: 6ad930f

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 is an automated backport that resolves an issue where the --no-header option was not functioning as expected during CSV data exports. The change ensures that when this option is enabled, the generated CSV files will correctly omit the header row, providing more control over the output format. It also includes new tests to validate this behavior.

Highlights

• CSV Export Header Fix: The --no-header option for CSV exports now correctly prevents the header row from being included in the output, addressing a previous bug where headers were always present.
• Enhanced Test Coverage: New unit tests have been added to CsvExportManagerTest to specifically verify the functionality of including and excluding the header row during CSV exports.

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[gemini-code-assist]

Code Review

This pull request backports a fix for the --no-header option in CSV exports. The change in CsvExportManager correctly adds a condition to skip writing the header. The accompanying tests in CsvExportManagerTest cover both scenarios (with and without header) using a new helper method. My feedback focuses on improving the robustness of file handling within the new test helper method to prevent potential issues with file path conflicts and resource leaks.