As is well known, this is a long-standing bug: VS Code always leaves behind old versions of extensions when upgrading extensions.
Previously, this space usage was not a problem, but with the emergence of AI programming extensions, after long-term operation, the size of the related extensions may reach the GB level, quickly filling up the disk.
The main function of this extension is to help you remove older versions of the extension on your Linux host and devcontainer, thus freeing up disk space.