Add unit test reproducing video GPS sidecar-to-database bug

Kristian Karlrequested to merge
kristiankarl/digikam:investigate_video_gps_overwrite into master

Bug report: https://bugs.kde.org/show_bug.cgi?id=520333

When a video has existing GPS coordinates in its container metadata and WRITE_TO_SIDECAR_ONLY is configured with the ExifTool backend, writing updated GPS to the XMP sidecar does not update the ImagePositions table on rescan. The VideoMerge backend reads metadata only from the video file, bypassing the sidecar entirely.

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

Edited by Kristian Karl

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