Side loaded extensions should not sync metadata from MP

Let's handle this case better https://thehackernews.com/2025/07/new-flaw-in-ides-like-visual-studio.html?m=1

As suggested by Sandeep:
1) If side-loaded extension is getting Updated to MP version, the Update button should be "Update to Marketplace Version" 
2) If side-loaded extension do not sync metadata from MP (until it is updated to marketplace version)

fyi @deepak1556 