Adding test for network policy regex

[Vincent056]

Added e2e test for configure-network-policies-namespaces rule, test if whitelist-regex works as expected.

This works in-conjunction with ComplianceAsCode/content#11952

[openshift-ci]

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[Vincent056]

/retest

[yuumasato]

Sorry @Vincent056 we got an error on t.Skip()
tests/e2e/serial/main_test.go:1965:3: (*testing.common).Skip call has possible formatting directive %s

[Vincent056]

/retest

[yuumasato]

@Vincent056 Still the same error:

# github.com/ComplianceAsCode/compliance-operator/tests/e2e/serial
tests/e2e/serial/main_test.go:1965:3: (*testing.common).Skip call has possible formatting directive %s
FAIL	github.com/ComplianceAsCode/compliance-operator/tests/e2e/serial [build failed]
FAIL
make: *** [Makefile:610: e2e-serial] Error 1

[openshift-ci]

@Vincent056: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-serial	6dd67e0	link	true	/test e2e-aws-serial

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