Revert/undo-788f5083-ef8657bb (#8353)

This reverts the addition of GTM for 1.38, as it was still present in
the built files.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8353-Revert-undo-788f5083-ef8657bb-2f66d73d365081818d43fcaab220a4ef)
by [Unito](https://www.unito.io)

src/platform/cloud/subscription/composables/useSubscription.test.ts

@@ -206,49 +206,6 @@ describe('useSubscription', () => {
       )
     })
 
-    it('pushes purchase event after a pending subscription completes', async () => {
-      window.dataLayer = []
-      localStorage.setItem(
-        'pending_subscription_purchase',
-        JSON.stringify({
-          tierKey: 'creator',
-          billingCycle: 'monthly',
-          timestamp: Date.now()
-        })
-      )
-
-      vi.mocked(global.fetch).mockResolvedValue({
-        ok: true,
-        json: async () => ({
-          is_active: true,
-          subscription_id: 'sub_123',
-          subscription_tier: 'CREATOR',
-          subscription_duration: 'MONTHLY'
-        })
-      } as Response)
-
-      mockIsLoggedIn.value = true
-      const { fetchStatus } = useSubscription()
-
-      await fetchStatus()
-
-      expect(window.dataLayer).toHaveLength(1)
-      expect(window.dataLayer?.[0]).toMatchObject({
-        event: 'purchase',
-        transaction_id: 'sub_123',
-        currency: 'USD',
-        items: [
-          {
-            item_id: 'monthly_creator',
-            item_variant: 'monthly',
-            item_category: 'subscription',
-            quantity: 1
-          }
-        ]
-      })
-      expect(localStorage.getItem('pending_subscription_purchase')).toBeNull()
-    })
-
     it('should handle fetch errors gracefully', async () => {
       vi.mocked(global.fetch).mockResolvedValue({
         ok: false,