Remove globalThisShim and globalThis modification for TypeScriptServicesFactory

Looking at github, sourcegraph, and internally, nobody appears to use
this factory at all.

It's still used within our testing framework, so I won't remove it, but
we shouldn't be polyfilling globalThis and sticking things onto it these
days.

Author: jakebailey

Diff for: src/services/_namespaces/ts.ts

@@ -17,7 +17,6 @@ export * from "../transpile";
 export * from "../services";
 export * from "../transform";
 export * from "../shims";
-export * from "../globalThisShim";
 import * as BreakpointResolver from "./ts.BreakpointResolver";
 export { BreakpointResolver };
 import * as CallHierarchy from "./ts.CallHierarchy";