Track reviewed files in VS Code

As part of Tracking reviewed files in MRs, the ability to track those across devices and platforms will be important.

As part of gitlab#17531 (comment 449871052) we should extend this capability to VS Code as we continue to build upon review features there.

Example of how this is done on the web:

mark-as-viewed

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Edited by Tomas Vik (OOO back on 2026-01-05)