Chore: resolve dynamic import warnings from pdfjs, again (#9924)

src-ui/__mocks__/pdfjs-dist.ts

@@ -0,0 +1,13 @@
+export const getDocument = jest.fn(() => ({
+  promise: Promise.resolve({ numPages: 3 }),
+}))
+
+export const GlobalWorkerOptions = { workerSrc: '' }
+export const VerbosityLevel = { ERRORS: 0 }
+
+globalThis.pdfjsLib = {
+  getDocument,
+  GlobalWorkerOptions,
+  VerbosityLevel,
+  AbortException: class AbortException extends Error {},
+}