[ts-hint] fix vscode type hint plugin enabling (#77099)
### What
Fix the enabling of ts hint plugin in vscode. This is a regression
introduced in #76300, where we use the plugin config `{ "name": "next"
}` to directly check if it has a `enabled` property, and determine if we
should enable the plugin. This PR fixed the way of reading plugin config
and keep it enabled by default.
Fixes 76980
