Improve Sync views

[sandy081]

• Show diff editor for all resources (extensions, global state)
• It's missing Revert to this state actions on any JSON file
• Show Remote backup view even if Sync is turned off with signed in user Sync wants to merge right after turning it on #96370
• Nuke button on Remote view Sync wants to merge right after turning it on #96370
• Show machines being synced
• Show client or machine information with sync data Add client or machine information to the remote backup view #96170

[texastoland]

One related note is it was unintuitive to find the backups because the activity bar icon seen in the docs is hidden unless one of its panels is already open.