Always mirror with --keep-manifest-list=true

[derekhiggins]

The code to conditionaly add --keep-manifest-list=true to the mirror command was added for a now unsupported version of OC. Remove it as it doesn't always work e.g. if the .releaseClientVersion doesn't follow the 4.XX... format.

4.15.0-0.nightly-2024-..-.....
vs
0.0.1-0.test-2024-....-latest

[openshift-ci]

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[openshift-ci]

@derekhiggins: 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-agent-ha-dualstack	7203534	link	false	/test e2e-agent-ha-dualstack
ci/prow/e2e-metal-ipi-serial-ovn-ipv6	7203534	link	false	/test e2e-metal-ipi-serial-ovn-ipv6
ci/prow/e2e-metal-ipi-serial-ipv4	7203534	link	true	/test e2e-metal-ipi-serial-ipv4

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[elfosardo]

/lgtm