Tests: Vitest configuration cleanup (#5888)

## Summary

Simplify default scripts. Filtering is still available to users, we can
revisit tagging or grouping later.
This fixes the issue where we had tests that were in the codebase but
never run because they weren't under `/src/components`

Also deletes the duplicate litegraph tests and their associated vitest
config file.

## Changes

- **What**: Test cleanup

## Review Focus

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5888-Tests-Vitest-configuration-cleanup-2806d73d36508197b800f68f0b028279)
by [Unito](https://www.unito.io)

src/renderer/extensions/vueNodes/widgets/components/WidgetTextarea.test.ts

@@ -153,21 +153,6 @@ describe('WidgetTextarea Value Binding', () => {
     })
   })
 
-  describe('Readonly Mode', () => {
-    it('disables textarea when readonly', () => {
-      const widget = createMockWidget('readonly test')
-      const wrapper = mountComponent(widget, 'readonly test', true)
-
-      const textarea = wrapper.find('textarea')
-      if (!(textarea.element instanceof HTMLTextAreaElement)) {
-        throw new Error(
-          'Textarea element not found or is not an HTMLTextAreaElement'
-        )
-      }
-      expect(textarea.element.disabled).toBe(true)
-    })
-  })
-
   describe('Component Rendering', () => {
     it('renders textarea component', () => {
       const widget = createMockWidget('test value')