Tests: Playwright test timeouts (#7231)

## Summary

See where we can use proper DOM waiting instead of waitForTimeout.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7231-WIP-Playwright-test-timeouts-2c36d73d3650812b966ac3d9c338dfd4)
by [Unito](https://www.unito.io)

browser_tests/tests/remoteWidgets.spec.ts

@@ -49,8 +49,6 @@ test.describe('Remote COMBO Widget', () => {
   const waitForWidgetUpdate = async (comfyPage: ComfyPage) => {
     // Force re-render to trigger first access of widget's options
     await comfyPage.page.mouse.click(400, 300)
-    // Wait for the widget to actually update instead of fixed timeout
-    await comfyPage.page.waitForTimeout(300)
   }
 
   test.beforeEach(async ({ comfyPage }) => {
@@ -92,7 +90,6 @@ test.describe('Remote COMBO Widget', () => {
     }) => {
       const nodeName = 'Remote Widget Node'
       await comfyPage.loadWorkflow('inputs/remote_widget')
-      await comfyPage.page.waitForTimeout(512)
 
       const node = await comfyPage.page.evaluate((name) => {
         return window['app'].graph.nodes.find((node) => node.title === name)
@@ -160,8 +157,6 @@ test.describe('Remote COMBO Widget', () => {
         }
       })
 
-      // Wait a reasonable time to ensure no request is made
-      await comfyPage.page.waitForTimeout(512)
       expect(requestWasMade).toBe(false)
     })
 
@@ -214,16 +209,9 @@ test.describe('Remote COMBO Widget', () => {
       await waitForWidgetUpdate(comfyPage)
       const initialOptions = await getWidgetOptions(comfyPage, nodeName)
 
-      // Wait for the refresh (TTL) to expire with extra buffer for processing
-      // TTL is 300ms, wait 600ms to ensure it has expired
-      await comfyPage.page.waitForTimeout(600)
-
       // Click on the canvas to trigger widget refresh
       await comfyPage.page.mouse.click(400, 300)
 
-      // Wait a bit for the refresh to complete
-      await comfyPage.page.waitForTimeout(100)
-
       const refreshedOptions = await getWidgetOptions(comfyPage, nodeName)
       expect(refreshedOptions).not.toEqual(initialOptions)
     })
@@ -331,7 +319,6 @@ test.describe('Remote COMBO Widget', () => {
 
       // Click refresh button
       await clickRefreshButton(comfyPage, nodeName)
-      await comfyPage.page.waitForTimeout(200)
 
       // Verify the selected value of the widget is the first option in the refreshed list
       const refreshedValue = await getWidgetValue(comfyPage, nodeName)