Add E2E cases for supporting node selector for repo maintenance job

[blackpiglet]

Describe the problem/challenge you have

Should add new E2E automation test cases to verify the repository maintenance Jobs supporting node selection.

The feature's issue is #7758.
The feature's design is https://github.com/vmware-tanzu/velero/blob/main/design/Implemented/repo_maintenance_job_config.md.

Describe the solution you'd like

Anything else you would like to add:

Environment:

• Velero version (use velero version):
• Kubernetes version (use kubectl version):
• Kubernetes installer & version:
• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release):

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[reasonerjt]

This is probably also covered by UT.

[blackpiglet]

The UT cases are

velero/pkg/repository/maintenance_test.go

Line 266 in 1d4f147

func TestGetMaintenanceJobConfig(t *testing.T) {

.

[blackpiglet]

Per previous comments, close as won't fix.