AGENT-974: Add integration test for agent minimal ISO

[bfournie]

Add some new integration functions to check minimum and maximum ISO file size along with a new integration test for the agent minimal ISO support.

[openshift-ci-robot]

@bfournie: This pull request references AGENT-974 which is a valid jira issue.

In response to [this](https://github.com/openshift/installer/pull/9139): >Add some new integration functions to check minimum and maximum ISO file size along with a new integration test for the agent minimal ISO support. Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Finstaller). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[bfournie]

/retest

[andfasano]

/approve

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andfasano

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/openshift/installer/blob/master/OWNERS)~~ [andfasano] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[openshift-ci[bot]]

@bfournie: The following test 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-compact-ipv4-add-nodes	ed654d5bc0d522e02cefce853253bcbed98bdcc1	link	false	/test e2e-agent-compact-ipv4-add-nodes

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository. I understand the commands that are listed [here](https://go.k8s.io/bot-commands).

[openshift-bot]

[ART PR BUILD NOTIFIER]

Distgit: ose-installer-terraform-providers This PR has been included in build ose-installer-terraform-providers-container-v4.18.0-202411051207.p0.g14c5266.assembly.stream.el9. All builds following this will include this PR.

[openshift-bot]

[ART PR BUILD NOTIFIER]

Distgit: ose-installer-altinfra This PR has been included in build ose-installer-altinfra-container-v4.18.0-202411051207.p0.g14c5266.assembly.stream.el9. All builds following this will include this PR.

[openshift-bot]

[ART PR BUILD NOTIFIER]

Distgit: ose-baremetal-installer This PR has been included in build ose-baremetal-installer-container-v4.18.0-202411051207.p0.g14c5266.assembly.stream.el9. All builds following this will include this PR.

[openshift-bot]

[ART PR BUILD NOTIFIER]

Distgit: ose-installer-artifacts This PR has been included in build ose-installer-artifacts-container-v4.18.0-202411051207.p0.g14c5266.assembly.stream.el9. All builds following this will include this PR.