User Story:
As an OpenShift Engineer I want update CI workflow of BYO IP (ipi-conf-aws-byo-ipv4-pool-public) to support BYO EIP for default router on install time so CI operations can have an option of a full cluster installed on AWS consuming all Public IPv4 address from a custom user-provided IPv4 pool, introduced on 4.16.

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Acceptance Criteria:
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issue created by splat-bot

Attach to Epic <https://issues.redhat.com/browse/SPLAT-1633|SPLAT-1633> .

Ref <https://issues.redhat.com/browse/SPLAT-1402|SPLAT-1402>.

WIP <https://github.com/openshift/release/pull/56960>.

FUP <https://redhat-internal.slack.com/archives/C066CA8U02Y/p1726842569373569?thread_ts=1713372704.700149&amp;cid=C066CA8U02Y>.