Disable for TypeScript 4.2+

[mjbvz]

Semantic highlighting support should now be built into the TypeScript server. We should :

• Quickly test to make sure there are no major regressions with the native TypeScript support
• Disable this plugin by default when the plugin is run with TypeScript 4.2
• At some point in the future (after giving users enough time to update to newer TS versions) stop including this plugin with VS Code.

[aeschli]

I tested that the tests also run with the built-in '2020' typescript support.
The plugin will not intercept when in >= 4.2

[jasonlyu123]

Hi. As far as I know. typescript's built-in semantic highlighting doesn't work with js files.
https://github.com/microsoft/TypeScript/blob/b1571fcb71501d16f21173979365d4c4d53a11cb/src/services/services.ts#L1888

I checked with the insider version of vscode. Semantic highlight no longer show up on js files on 1.55.0 insider with commit d06d2f1d6245ce00b1c36a9cd81a9087d225173e.

insider version:

1.54: