Add support for testing OADP with custom Velero PRs in Makefile and documentation

[kaovilai]

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

Why the changes were made

How to test the changes made

[openshift-ci]

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✨ Finishing touches

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kaovilai

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[openshift-ci]

@kaovilai: 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/4.20-e2e-test-cli-aws	4c3f5c6	link	true	/test 4.20-e2e-test-cli-aws

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