Flaky tests and observable state (#1526)

* Fix missing await

* Fix flaky tests - keyboard combos

Old code is causing playwright &/ changeTracker to add an undo step.  Using combo mode resolves flakiness until that can be investigated thoroughly.

* Restore skipped tests

* Fix flaky tests

* Async clean up

* Fix test always fails on retry

* Add TS types (tests)

* Fix flaky test

* Add observable busy state to workflow store

* Add workflow store busy wait to tests

* Rename test for clarity

* Fix flaky tests - use press() from locator API

Ref: https://playwright.dev/docs/api/class-keyboard#keyboard-press

* Fix flaky test - wait next frame

* Add delay between mouse events

Litegraph pointer handling is all custom coded, so a adding a delay between events for a bit of reality is actually beneficial.

browser_tests/nodeSearchBox.spec.ts

@@ -15,7 +15,7 @@ test.describe('Node search box', () => {
 
   test(`Can trigger on group body double click`, async ({ comfyPage }) => {
     await comfyPage.loadWorkflow('single_group_only')
-    await comfyPage.page.mouse.dblclick(50, 50)
+    await comfyPage.page.mouse.dblclick(50, 50, { delay: 5 })
     await comfyPage.nextFrame()
     await expect(comfyPage.searchBox.input).toHaveCount(1)
   })