Fix release announcement test flake (#30250)

* chore: add `hideJumpToBottomButton` option to playwright screenshot

* test: hide jump to bottom button in release announcement test

playwright/e2e/release-announcement/index.ts

@@ -42,7 +42,10 @@ export class Helpers {
      */
     async assertReleaseAnnouncementIsVisible(name: string) {
         await expect(this.getReleaseAnnouncement(name)).toBeVisible();
-        await expect(this.page).toMatchScreenshot(`release-announcement-${name}.png`, { showTooltips: true });
+        await expect(this.page).toMatchScreenshot(`release-announcement-${name}.png`, {
+            showTooltips: true,
+            hideJumpToBottomButton: true,
+        });
     }
 
     /**

playwright/element-web-test.ts

@@ -107,6 +107,7 @@ interface ExtendedToMatchScreenshotOptions extends ToMatchScreenshotOptions {
     includeDialogBackground?: boolean;
     showTooltips?: boolean;
     timeout?: number;
+    hideJumpToBottomButton?: boolean;
 }
 
 type Expectations = {
@@ -165,6 +166,14 @@ export const expect = baseExpect.extend<Expectations>({
             `;
         }
 
+        if (options?.hideJumpToBottomButton) {
+            css += `
+                .mx_JumpToBottomButton {
+                    display: none !important;
+                }
+            `;
+        }
+
         if (options?.css) {
             css += options.css;
         }