Improve the teardown part for toleration cleanup

[vkathole]

#9920 (comment)

I see you have added tolerations on configmap and ocsint in func apply_custom_taint_and_toleration() and also since this test has the ability to run on all ODF versions >, < 4.16, the cleanup should be according to that. Removing toleration just from storagecluster might not be right for version < 4.16