Make flaky annotation tests a little bit more resiliant on CI

__tests__/integration/mirador/annotations.test.js

@@ -3,7 +3,7 @@
 describe('Annotations in Mirador', () => {
   beforeAll(async () => {
     await page.goto('http://127.0.0.1:4488/__tests__/integration/mirador/');
-    await expect(page).toMatchElement('.mirador-window', { polling: 'mutation', timeout: 5000 });
+    await expect(page).toMatchElement('.mirador-window[aria-label="Window: Self-Portrait Dedicated to Paul Gauguin"]', { polling: 'mutation', timeout: 5000 });
   });
   it('stores annotations in state by canvasId', async () => {
     const annotations = await page.evaluate(() => (
@@ -25,7 +25,7 @@ describe('Annotations in Mirador', () => {
     await expect(page).toClick(`#${windowId} button[aria-label="Annotations"]`);
 
     await expect(page).toMatchElement(`#${windowId} h3`, { text: 'Annotations' });
-    await expect(page).toMatchElement(`#${windowId} p`, { text: 'Showing 5 annotations' });
+    await expect(page).toMatchElement(`#${windowId} p`, { polling: 'mutation', text: 'Showing 5 annotations', timeout: 2000 });
     await expect(page).toMatchElement(`#${windowId} .mirador-companion-window-left.mirador-window-sidebar-annotation-panel ul li`, { count: 2 });
   });
 });