Improve export scripts and small patches

[kirbyh]

Improvements to utils/export.py to return a list of files to export (say, in a tarball)

Small bug fixes to BudgetIO.get_ustar() and other helper functions.

[Copilot]

Pull request overview

This PR refactors the export utilities to support creating file lists for tarball generation and fixes bugs in BudgetIO helper functions.

Key changes:

• Extracts file listing logic into a new list_padeops_files() function that returns file paths instead of copying them
• Adds print_files_stdout() function for command-line usage with tar
• Implements the previously stubbed export_concurrent() function with basic command-line argument handling

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 9 comments.

File	Description
padeopsIO/utils/export.py	Refactors copy_padeops_data to extract file listing logic into list_padeops_files, adds print_files_stdout helper, and implements basic CLI for export_concurrent
padeopsIO/budgetIO.py	Adds query_logfile method, fixes parameter name in get_ustar call (from search_str to logfile), and updates documentation

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