End-to-end tests fail cleaning up node pools

[rhmdnd]

Recently, we've been seeing e2e failures that look like:

     helpers.go:1140: 2023-03-10T16:16:17Z: All machines updated
    helpers.go:180: 2023-03-10T16:16:17Z: Removing pool e2e
    helpers.go:191: 2023-03-10T16:16:17Z: Removing pool e2e-invalid
    helpers.go:194: E2E-FAILURE: 2023-03-10T16:16:17Z: Could not remove pool e2e-invalid: Delete "https://api.ci-op-80s6kmwz-f837a.origin-ci-int-aws.dev.rhcloud.com:6443/apis/machineconfiguration.openshift.io/v1/machineconfigpools/e2e-invalid": read tcp 10.131.94.172:55938->50.18.129.189:6443: read: connection reset by peer
time="2023-03-10T16:16:17Z" level=info msg="Skipping cleanup function since --skip-cleanup-error is true"
--- FAIL: TestE2E (2289.37s)
    --- PASS: TestE2E/Serial_tests (2011.23s)
        --- PASS: TestE2E/Serial_tests/TestScanStorageOutOfQuotaRangeFails (5.34s)
        --- PASS: TestE2E/Serial_tests/TestSuiteScan (126.38s)
        --- PASS: TestE2E/Serial_tests/TestTolerations (65.55s)
        --- PASS: TestE2E/Serial_tests/TestAutoRemediate (327.29s)
        --- PASS: TestE2E/Serial_tests/TestUnapplyRemediation (377.71s)
        --- PASS: TestE2E/Serial_tests/TestInconsistentResult (65.89s)
        --- PASS: TestE2E/Serial_tests/TestPlatformAndNodeSuiteScan (166.40s)
        --- PASS: TestE2E/Serial_tests/TestUpdateRemediation (377.89s)
        --- PASS: TestE2E/Serial_tests/TestProfileBundleDefaultIsKept (165.67s)
        --- PASS: TestE2E/Serial_tests/TestVariableTemplate (151.26s)
        --- PASS: TestE2E/Serial_tests/TestKubeletConfigRemediation (181.85s)
FAIL
time="2023-03-10T16:16:19Z" level=warning msg="13 scans not cleaned up"
FAIL	github.com/ComplianceAsCode/compliance-operator/tests/e2e	2292.253s
FAIL
make[1]: *** [Makefile:568: e2e] Error 1
make[1]: Leaving directory '/go/src/github.com/ComplianceAsCode/compliance-operator'
make: *** [Makefile:576: e2e-serial] Error 2
{"component":"entrypoint","error":"wrapped process failed: exit status 2","file":"k8s.io/test-infra/prow/entrypoint/run.go:79","func":"k8s.io/test-infra/prow/entrypoint.Options.Run","level":"error","msg":"Error executing test process","severity":"error","time":"2023-03-10T16:16:19Z"}
error: failed to execute wrapped command: exit status 2 
INFO[2023-03-10T16:16:28Z] Step e2e-aws-serial-test failed after 39m20s. 
INFO[2023-03-10T16:16:28Z] Step phase test failed after 39m20s.         

Even though all the tests pass, the entire suite fails (presumably because the cleanup fails).

[rhmdnd]

This cropped up in #223

It's cropped up in other PRs too, but I don't have a list.

It would be nice to make the cleanup code more robust (if that is indeed the problem) so we don't have to recheck this issue.