fix(ngcc): viaModule should be null for local imports (#36989)

In the CommonJS and UMD reflection hosts, the logic for computing the
`viaModule` property of `Declaration` objects was not correct for some
cases when getting the exports of modules.

In these cases it was setting `viaModule` to the path of the local module
rather than `null`.

PR Close #36989

packages/compiler-cli/ngcc/src/host/commonjs_umd_utils.ts

@@ -56,7 +56,7 @@ export interface RequireCall extends ts.CallExpression {
  * `ts.Identifier` corresponding to `<namespace>` will be returned). Otherwise return `null`.
  */
 export function findNamespaceOfIdentifier(id: ts.Identifier): ts.Identifier|null {
-  return id.parent && ts.isPropertyAccessExpression(id.parent) &&
+  return id.parent && ts.isPropertyAccessExpression(id.parent) && id.parent.name === id &&
           ts.isIdentifier(id.parent.expression) ?
       id.parent.expression :
       null;