NO-ISSUE: Fix unittest for CleanupBackups

[Missxiaoguo]

Background / Context

Fix the race condition in the testcase for CleanupBackups. To mock the deletion of a backup, backup CR should be deleted first, followed by the backupDeleteRequest CR.

Issue / Requirement / Reason for change

Solution / Feature Overview

Implementation Details

Other Information

[Missxiaoguo]

/cc @donpenney @leo8a

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: donpenney

The full list of commands accepted by this bot can be found here.

The pull request process is described here

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

[openshift-ci-robot]

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

In response to [this](https://github.com/openshift-kni/lifecycle-agent/pull/638): > > ># Background / Context >Fix the race condition in the testcase for CleanupBackups. To mock the deletion of a backup, backup CR should be deleted first, followed by the backupDeleteRequest CR. > > > ># Issue / Requirement / Reason for change > > > ># Solution / Feature Overview > > > ># Implementation Details > > > ># Other Information > > > > > Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift-kni%2Flifecycle-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-ci[bot]]

@Missxiaoguo: 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/ibu-e2e-flow	5a63166733e9e6bd2af71908572fa0da1ecc54c0	link	false	/test ibu-e2e-flow

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).

[donpenney]

/cherrypick release-4.17 release-4.16 release-4.15 release-4.14

[openshift-cherrypick-robot]

@donpenney: new pull request created: #645

In response to [this](https://github.com/openshift-kni/lifecycle-agent/pull/638#issuecomment-2321887720): >/cherrypick release-4.17 release-4.16 release-4.15 release-4.14 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.