Skip ambient modules in globalThis (#48938)

* Skip ambient modules in globalThis

Previously, globalThis mistakenly included ambient modules, even though
these are not values:

```ts
declare module "ambientModule" {
  export type typ = 1
  export var val: typ
}
type Oops = (typeof globalThis)[\"ambientModule\"]
```

This PR adds ambient modules to the kinds of things that are skipped
when constructing `globalThis`' properties, along with block-scoped
variables.

* Skip only modules with every declaration ambient

The modules are required to have at least one declaration so that our
treatment of `globalThis` stays the same, and
`globalThis.globalThis.globalThis` remains legal.

src/compiler/checker.ts

@@ -11504,7 +11504,7 @@ namespace ts {
                 if (symbol === globalThisSymbol) {
                     const varsOnly = new Map<string, Symbol>() as SymbolTable;
                     members.forEach(p => {
-                        if (!(p.flags & SymbolFlags.BlockScoped)) {
+                        if (!(p.flags & SymbolFlags.BlockScoped) && !(p.flags & SymbolFlags.ValueModule && p.declarations?.length && every(p.declarations, isAmbientModule))) {
                             varsOnly.set(p.escapedName, p);
                         }
                     });