feat: update vscode-based desktop IDE modules to use vscode-desktop-core

[phorcys420]

Depends on #278

Part of WL-27

[phorcys420]

seems like the .tftest.hcl files also need some updating, which makes sense, but i'd like some input on what we actually want to do for these tests before i spend time on it

should i update .test.ts files or .tftest.hcl files?
and also, do we want to keep these tests if they're already being surfaced by vscode-desktop-core? if yes, do we have an idea on how to reduce duplicating code?

cc @DevelopmentCats @matifali

EDIT: after chatting with @DevelopmentCats, we chose to centralize tests in vscode-desktop-core

[matifali]

Does it cover all of them? We recently added positorn and antigravity modules.

[phorcys420]

@matifali it doesn't cover positron actually, i will fix this soon, but antigravity is not merged yet

[matifali]

LGTM. But lets ensure we test them

[phorcys420]

@matifali i have already tested them a couple weeks ago and nothing changed seemingly, but i will test again to make sure