consolidate workspaceFolders logic

[kyleli626]

right now, in many many files, we retrieve workspaceFolder[0] and have to check for errors. wouldn't it be easier to do this all at once and set this in a context variable or something? Maybe in utils.ts

Command-shift-f: vscode.workspace.workspaceFolders

This shows up like 18 times, lets make it show up like once.