Add a getDocId method to the idFactory, in Page instances, to avoid passing around PDFManager instances unnecessarily (PR 7941 follow-up)

This way we can avoid manually building a "document id" in multiple places in `evaluator.js`, and it also let's us avoid passing in an otherwise unnecessary `PDFManager` instance when creating a `PartialEvaluator`.

test/unit/test_utils.js

@@ -16,6 +16,7 @@
 import { assert, CMapCompressionType } from '../../src/shared/util';
 import isNodeJS from '../../src/shared/is_node';
 import { isRef } from '../../src/core/primitives';
+import { Page } from '../../src/core/document';
 
 class DOMFileReaderFactory {
   static async fetch(params) {
@@ -158,6 +159,18 @@ class XRefMock {
   }
 }
 
+function createIdFactory(pageIndex) {
+  const page = new Page({
+    pdfManager: {
+      get docId() {
+        return 'd0';
+      },
+    },
+    pageIndex,
+  });
+  return page.idFactory;
+}
+
 export {
   DOMFileReaderFactory,
   NodeFileReaderFactory,
@@ -166,4 +179,5 @@ export {
   XRefMock,
   buildGetDocumentParams,
   TEST_PDFS_PATH,
+  createIdFactory,
 };