When using viewer.js code in an iframe (`web/viewer.html?file=my.pdf"`) and getting a load error like `Error: file origin does not match viewer's` how do I catch this error?  The console reports `app.js:2140 Uncaught (in promise) Error: file origin does not match viewer's`.  I have setup the load listener and am using the `PDFViewerApplication.initializedPromise`.  I was hoping the `PDFViewerApplication.initializedPromise` would reject, but it does not.  I could not find an eventbus event to listen to specifically for load errors either.

I would like to programmatically detect such load errors and dynamically remove the iframe hosting the pdf viewer and instead replace it with my own error messaging.  I can't figure out how to do that.

Configuration:
- Any, but testing on Chrome 97.0.4692.71 64-bit
- Ubuntu 20.04
- PDF.js version:  v2.12.313
- Is a browser extension: No

Steps to reproduce the problem:
1.  Purposely try to load a PDF in a way that would cause the `app.js:2140 Uncaught (in promise) Error: file origin does not match viewer's` error.
if (!GlobalWorkerOptions.workerSrc) {
    GlobalWorkerOptions.workerSrc = AppOptions.get("workerSrc");
  }
  if (typeof PDFJSDev === "undefined" || !PDFJSDev.test("PRODUCTION")) {
    window.pdfjsWorker = await import("pdfjs/core/worker.js");
    return;
  }
  await loadScript(PDFWorker.workerSrc);
}
async function initPDFBug(enabledTabs) {
  const { debuggerScriptPath, mainContainer } = PDFViewerApplication.appConfig;
  await loadScript(debuggerScriptPath);
  PDFBug.init({ OPS }, mainContainer, enabledTabs);
}
function reportPageStatsPDFBug({ pageNumber }) {
  if (typeof Stats === "undefined" || !Stats.enabled) {
    return;
  }
  const pageView = PDFViewerApplication.pdfViewer.getPageView(
     pageNumber - 1
  );
  const pageStats = pageView?.pdfPage?.stats;
  if (!pageStats) {
    return;
  }
  Stats.add(pageNumber, pageStats);
}
function webViewerInitialized() {