[release-ocm-2.9] NO-ISSUE: Use archived dnf repositories for centos8 as the current ones are no longer valid

[danmanor]

CentOS Linux 8 had reached the End Of Life (EOL) on December 31st, 2021. It means that CentOS 8 will no longer receive development resources from the official CentOS project. After Dec 31st, 2021, if you need to update your CentOS, you need to change the mirrors to vault.centos.org where they will be archived permanently. Alternatively, you may want to upgrade to CentOS Stream.

from - https://techglimpse.com/failed-metadata-repo-appstream-centos-8/

[openshift-ci-robot]

@danmanor: This pull request explicitly references no jira issue.

In response to [this](https://github.com/openshift/assisted-installer-agent/pull/722): >[CentOS Linux 8 had reached the End Of Life (EOL)](https://www.centos.org/centos-linux-eol/) on December 31st, 2021. It means that CentOS 8 will no longer receive development resources from the official CentOS project. After Dec 31st, 2021, if you need to update your CentOS, you need to change the mirrors to [vault.centos.org](https://vault.centos.org/) where they will be archived permanently. Alternatively, you may want to [upgrade to CentOS Stream](https://techglimpse.com/convert-centos8-linux-centosstream/). > >from - https://techglimpse.com/failed-metadata-repo-appstream-centos-8/ Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Fassisted-installer-agent). 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.

[openshift-merge-robot]

PR needs rebase.

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[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danmanor

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/openshift/assisted-installer-agent/blob/release-ocm-2.9/OWNERS)~~ [danmanor] 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]]

@danmanor: 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/mce-images	c69522a77b35ea4e53876a7a6af5b179cf807c8f	link	true	/test mce-images
ci/prow/subsystem-test	c69522a77b35ea4e53876a7a6af5b179cf807c8f	link	true	/test subsystem-test
ci/prow/images	c69522a77b35ea4e53876a7a6af5b179cf807c8f	link	true	/test images
ci/prow/lint	c69522a77b35ea4e53876a7a6af5b179cf807c8f	link	true	/test lint
ci/prow/unit-test	c69522a77b35ea4e53876a7a6af5b179cf807c8f	link	true	/test unit-test
ci/prow/e2e-ai-operator-ztp	c69522a77b35ea4e53876a7a6af5b179cf807c8f	link	true	/test e2e-ai-operator-ztp

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).