Dont consider global augmentation top-level members as having the export modifier (#23846)

* Dont consider global argumentation top-level members as having the export modifier

* Remove unneeded test parts from repro

src/compiler/checker.ts

@@ -21319,7 +21319,7 @@ namespace ts {
                 n.parent.kind !== SyntaxKind.ClassDeclaration &&
                 n.parent.kind !== SyntaxKind.ClassExpression &&
                 n.flags & NodeFlags.Ambient) {
-                if (!(flags & ModifierFlags.Ambient)) {
+                if (!(flags & ModifierFlags.Ambient) && !(isModuleBlock(n.parent) && isModuleDeclaration(n.parent.parent) && isGlobalScopeAugmentation(n.parent.parent))) {
                     // It is nested in an ambient context, which means it is automatically exported
                     flags |= ModifierFlags.Export;
                 }