Make direct assignments to cjs exports considered literal contexts (#39816)

* Make direct assignments to cjs exports considered literal contexts

* Style feedback from PR

* Trailing whitespaaaaace

tests/cases/compiler/jsExportAssignmentNonMutableLocation.ts

@@ -0,0 +1,15 @@
+// @declaration: true
+// @emitDeclarationOnly: true
+// @allowJs: true
+// @checkJs: true
+// @module: commonjs
+// @target: es6
+// @filename: file.js
+const customSymbol = Symbol("custom");
+
+// This is a common pattern in Node’s built-in modules:
+module.exports = {
+    customSymbol,
+};
+
+exports.customSymbol2 = Symbol("custom");

tests/cases/fourslash/inlayHintsShouldWork46.ts

@@ -16,13 +16,13 @@ goTo.file('/b.js')
 const markers = test.markers();
 verify.getInlayHints([
     {
-        text: ': number',
+        text: ': 1',
         position: markers[0].position,
         kind: ts.InlayHintKind.Type,
         whitespaceBefore: true
     },
     {
-        text: ': number',
+        text: ': 1',
         position: markers[1].position,
         kind: ts.InlayHintKind.Type,
         whitespaceBefore: true