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/fixtures/components/ComfyNodeSearchBox.ts

@@ -60,9 +60,6 @@ export class ComfyNodeSearchBox {
     await this.input.waitFor({ state: 'visible' })
     await this.input.fill(nodeName)
     await this.dropdown.waitFor({ state: 'visible' })
-    // Wait for some time for the auto complete list to update.
-    // The auto complete list is debounced and may take some time to update.
-    await this.page.waitForTimeout(500)
     await this.dropdown
       .locator('li')
       .nth(options?.suggestionIndex || 0)

browser_tests/fixtures/components/SidebarTab.ts

@@ -116,7 +116,6 @@ export class WorkflowsSidebarTab extends SidebarTab {
   async switchToWorkflow(workflowName: string) {
     const workflowLocator = this.getOpenedItem(workflowName)
     await workflowLocator.click()
-    await this.page.waitForTimeout(300)
   }
 
   getOpenedItem(name: string) {
@@ -138,7 +137,6 @@ export class WorkflowsSidebarTab extends SidebarTab {
       .click()
     await this.page.keyboard.type(newName)
     await this.page.keyboard.press('Enter')
-    await this.page.waitForTimeout(300)
   }
 
   async insertWorkflow(locator: Locator) {

browser_tests/fixtures/components/Topbar.ts

@@ -95,7 +95,6 @@ export class Topbar {
   }
 
   async openTopbarMenu() {
-    await this.page.waitForTimeout(1000)
     await this.menuTrigger.click()
     await this.menuLocator.waitFor({ state: 'visible' })
     return this.menuLocator