update 4.17 xpath for choose_metrics_query and click_metrics_query_dropdown action for OCP-44791

[juzhao]

see https://issues.redhat.com/browse/OCPQE-25335, OCP-44791 failed in 4.17 due to 4.17 UI change, update 4.17 xpath for choose_metrics_query and click_metrics_query_dropdown action for OCP-44791

[pruan-rht]

@Xia-Zhao-rh @yapei can you PTAL?

[yapei]

/lgtm

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