IBX-10233: File migration fails when a whole batch of files is missing (ibexa:io:migrate-files)

[vidarl]

🎫 Issue	IBX-10233

Description:

If all files in the current bulk are missing, then $metadataList ($metadataList = $fileLister->loadMetadataList($bulkCount, $offset);) will be a empty list. This will cause the loop to be exited prematurely ( while (count($metadataList) > 0) )

For QA:

Documentation:

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull Request Overview

This PR fixes a bug in the file migration command where the migration process would terminate prematurely if an entire batch of files was missing. The fix changes the loop termination condition from checking if the current batch has files to verifying if there are more files to process based on the total file count.

Key Changes:

• Store the total file count before starting the migration loop
• Calculate offset explicitly for better readability
• Replace batch-based loop condition with offset-based condition that checks against total file count

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