Refactor removed_api_tests to tests against sorted strings to avoid flakiness

[perdasilva]

There seems to be some flakiness on the order of the APIs. E.g.

        removed_apis_test.go:286: 
            	Error Trace:	removed_apis_test.go:286
            	Error:      	[]string{"this bundle is using APIs which were deprecated and removed in v1.25. More info: https://kubernetes.io/docs/reference/using-api/deprecation-guide/#v1-25. Migrate the API(s) for HorizontalPodAutoscaler: ([\"memcached-operator-hpa\"]),PodDisruptionBudget: ([\"memcached-operator-policy-manager\"]),"} does not contain "this bundle is using APIs which were deprecated and removed in v1.25. More info: https://kubernetes.io/docs/reference/using-api/deprecation-guide/#v1-25. Migrate the API(s) for PodDisruptionBudget: ([\"memcached-operator-policy-manager\"]),HorizontalPodAutoscaler: ([\"memcached-operator-hpa\"]),"
            	Test:       	TestValidateDeprecatedAPIS/should_return_a_warning_if_the_k8sVersion_is_empty_and_found_removed_APIs_on_1.25

from here

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[camilamacedo86]

/lgtm

Thank you for sort it out.