Remove CertRotationTimeUpgradableController

[vrutkovs]

After ShortCertRotation enhancement, this controller is no longer being used

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vrutkovs

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[openshift-ci]

@vrutkovs: The following tests 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-ovn-serial-1of2	7ff70f1	link	true	/test e2e-aws-ovn-serial-1of2
ci/prow/okd-scos-e2e-aws-ovn	7ff70f1	link	false	/test okd-scos-e2e-aws-ovn
ci/prow/e2e-azure-ovn	7ff70f1	link	false	/test e2e-azure-ovn
ci/prow/e2e-aws-ovn-single-node	7ff70f1	link	false	/test e2e-aws-ovn-single-node
ci/prow/e2e-gcp-operator-single-node	7ff70f1	link	false	/test e2e-gcp-operator-single-node
ci/prow/e2e-aws-ovn	7ff70f1	link	true	/test e2e-aws-ovn
ci/prow/e2e-aws-ovn-serial-2of2	7ff70f1	link	true	/test e2e-aws-ovn-serial-2of2

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