Load the non-test files with standard import statements when running the unit-tests

The unit-test files themselves shouldn't be loaded until Jasmine has been setup/configured, however that doesn't matter for the "normal" PDF.js library files. Hence we can simply `import` them in the standard way.

test/unit/.eslintrc

@@ -4,6 +4,9 @@
   ],
 
   "rules": {
+    // Plugins
+    "import/no-unresolved": ["error", { "ignore": ["pdfjs/"] }],
+
     // ECMAScript 6
     "no-var": "error",
   },

test/unit/jasmine-boot.js

@@ -40,16 +40,16 @@
 
 "use strict";
 
+import { GlobalWorkerOptions } from "pdfjs/display/worker_options.js";
+import { isNodeJS } from "pdfjs/shared/is_node.js";
+import { PDFFetchStream } from "pdfjs/display/fetch_stream.js";
+import { PDFNetworkStream } from "pdfjs/display/network.js";
+import { setPDFNetworkStreamFactory } from "pdfjs/display/api.js";
 import { TestReporter } from "./testreporter.js";
 
 async function initializePDFJS(callback) {
-  const modules = await Promise.all(
+  await Promise.all(
     [
-      "pdfjs/display/api.js",
-      "pdfjs/display/worker_options.js",
-      "pdfjs/display/network.js",
-      "pdfjs/display/fetch_stream.js",
-      "pdfjs/shared/is_node.js",
       "pdfjs-test/unit/annotation_spec.js",
       "pdfjs-test/unit/annotation_storage_spec.js",
       "pdfjs-test/unit/api_spec.js",
@@ -89,13 +89,6 @@ async function initializePDFJS(callback) {
       return import(moduleName);
     })
   );
-  const [
-    { setPDFNetworkStreamFactory },
-    { GlobalWorkerOptions },
-    { PDFNetworkStream },
-    { PDFFetchStream },
-    { isNodeJS },
-  ] = modules;
 
   if (isNodeJS) {
     throw new Error(