testing: codeflare: sdk_user/sample/sample: retry 'cluster.wait_ready' multiple times

[kpouget]

as a workaround for project-codeflare/codeflare-sdk#250

[openshift-ci]

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[kpouget]

/test codeflare-light

[kpouget]

/test codeflare-e2e keep

[openshift-ci]

@kpouget: 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/codeflare-e2e	967d77d	link	true	/test codeflare-e2e

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[kpouget]

/test codeflare-light

[kpouget]

test passed, merging