Fix: Flaky Playwright Tests: retry some assertions (#7389)

## Summary

Retries the widget value change check for up to 2 whole seconds.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7389-Fix-remoteWidgets-Playwright-test-add-retry-for-assertion-2c66d73d3650814e98b6fdfc83f6d3d6)
by [Unito](https://www.unito.io)

browser_tests/helpers/templates.ts

@@ -1,4 +1,5 @@
 import type { Locator, Page } from '@playwright/test'
+import { expect } from '@playwright/test'
 import path from 'path'
 
 import type {
@@ -8,9 +9,20 @@ import type {
 
 export class ComfyTemplates {
   readonly content: Locator
+  readonly allTemplateCards: Locator
 
   constructor(readonly page: Page) {
     this.content = page.getByTestId('template-workflows-content')
+    this.allTemplateCards = page.locator('[data-testid^="template-workflow-"]')
+  }
+
+  async waitForMinimumCardCount(count: number) {
+    return await expect(async () => {
+      const cardCount = await this.allTemplateCards.count()
+      expect(cardCount).toBeGreaterThanOrEqual(count)
+    }).toPass({
+      timeout: 1_000
+    })
   }
 
   async loadTemplate(id: string) {