test(execution): isolate rate-limit gate test from STEP 7 reservation

The 'consumes the rate-limit gate once' test reached the STEP 7 admission
reservation, which depends on Redis — it passed locally (reserve throws and is
swallowed) but failed in CI (reserve returns not-reserved -> 429). Pass
skipConcurrencyReservation so the test isolates the rate gate deterministically.

Author: waleedlatif1

apps/sim/lib/execution/preprocessing.test.ts

@@ -257,7 +257,13 @@ describe('preprocessExecution ban gate', () => {
   it('consumes the rate-limit gate exactly once when the ban and usage gates pass', async () => {
     mockCheckRateLimit.mockResolvedValue({ allowed: true, remaining: 5, resetAt: new Date() })
 
-    const result = await preprocessExecution({ ...baseOptions, checkRateLimit: true })
+    // skipConcurrencyReservation bypasses the STEP 7 admission reservation so the
+    // assertion isolates the rate gate and does not depend on Redis availability.
+    const result = await preprocessExecution({
+      ...baseOptions,
+      checkRateLimit: true,
+      skipConcurrencyReservation: true,
+    })
 
     expect(result.success).toBe(true)
     expect(mockCheckRateLimit).toHaveBeenCalledTimes(1)