Add diagnostic logging for PrepareRepo bug detection in backup and node-agent functions

[kaovilai]

Signed-off-by: Tiger Kaovilai tkaovila@redhat.com

Why the changes were made

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/test all

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[APPROVALNOTIFIER] This PR is APPROVED

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/test all

[kaovilai]

/test all

[openshift-ci]

@kaovilai: 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/4.20-e2e-test-hcp-aws	6f21c95	link	false	/test 4.20-e2e-test-hcp-aws
ci/prow/4.19-e2e-test-kubevirt-aws	6f21c95	link	true	/test 4.19-e2e-test-kubevirt-aws
ci/prow/4.19-e2e-test-cli-aws	6f21c95	link	true	/test 4.19-e2e-test-cli-aws
ci/prow/4.19-e2e-test-hcp-aws	6f21c95	link	true	/test 4.19-e2e-test-hcp-aws

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[kaovilai]

vmware-tanzu/velero#9400