test(flaky): unreliable test: zipCode performance tests aws#6120

Problem:
unreliable test "zipCode performance".

Solution:
increase cpu threshold for performance test to avoid flakiness
fix aws#6117

Author: Hweinstock

packages/core/src/testInteg/perf/zipcode.test.ts

@@ -40,7 +40,7 @@ async function setup(numberOfFiles: number, fileSize: number): Promise<SetupResu
 function performanceTestWrapper(numberOfFiles: number, fileSize: number) {
     return performanceTest(
         getEqualOSTestOptions({
-            userCpuUsage: 200,
+            userCpuUsage: 300,
             systemCpuUsage: 50,
             heapTotal: 4,
         }),