test: use createTestingPinia instead of createPinia (#8376)

Replace \createPinia\ with \createTestingPinia({ stubActions: false })\
from \@pinia/testing\ across 45 test files for proper test isolation.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8376-test-use-createTestingPinia-instead-of-createPinia-2f66d73d36508137a9f0daffcddc86f7)
by [Unito](https://www.unito.io)

Co-authored-by: Amp <amp@ampcode.com>

src/stores/workspace/nodeHelpStore.test.ts

@@ -1,4 +1,5 @@
-import { createPinia, setActivePinia } from 'pinia'
+import { createTestingPinia } from '@pinia/testing'
+import { setActivePinia } from 'pinia'
 import { beforeEach, describe, expect, it } from 'vitest'
 
 import { useNodeHelpStore } from '@/stores/workspace/nodeHelpStore'
@@ -14,7 +15,7 @@ describe('nodeHelpStore', () => {
   }
 
   beforeEach(() => {
-    setActivePinia(createPinia())
+    setActivePinia(createTestingPinia({ stubActions: false }))
   })
 
   it('should initialize with empty state', () => {