Whitelist closure related cases to address the remaining no-shadow linting errors

Given the way that "classes" were previously implemented in PDF.js, using regular functions and closures, there's a fair number of false positives when the `no-shadow` ESLint rule was enabled.

Note that while *some* of these `eslint-disable` statements can be removed if/when the relevant code is converted to proper `class`es, we'll probably never be able to get rid of all of them given our naming/coding conventions (however I don't really see this being a problem).

src/core/worker.js

@@ -38,6 +38,7 @@ import { PDFWorkerStream } from "./worker_stream.js";
 import { XRefParseException } from "./core_utils.js";
 
 var WorkerTask = (function WorkerTaskClosure() {
+  // eslint-disable-next-line no-shadow
   function WorkerTask(name) {
     this.name = name;
     this.terminated = false;