test(policychecks): remove flaky executeCommand check #6009

## Problem
Flaky tests: #5996

## Solution
The check for executeCommand is not important to these tests, and can be
removed.

fix #5996

Author: kevluu-aws

packages/core/src/test/awsService/accessanalyzer/iamPolicyChecks.test.ts

@@ -369,7 +369,6 @@ describe('customChecks', function () {
         assert.deepStrictEqual(actualCommand.referencePolicyType, policyType)
 
         assert(onCustomPolicyCheckResponseFireSpy.notCalled)
-        assert(executeCommandStub.notCalled)
     })
 
     it('checkNoNewAccess should handle CloudFormation document type correctly', async function () {
@@ -400,7 +399,6 @@ describe('customChecks', function () {
         assert.deepStrictEqual(actualCommand.referencePolicyType, policyType)
 
         assert(onCustomPolicyCheckResponseFireSpy.notCalled)
-        assert(executeCommandStub.notCalled)
     })
 
     it('checkNoNewAccess should handle missing reference document', async function () {