Removal 4.15 to 4.22 upgrade configs

[JianLi-RH]

OCP 4.15 is EOL, so remove the upgrade configs for 4.15 to 4.22.

[JianLi-RH]

/uncc @asood-rh @lihongan

[JianLi-RH]

/cc @jiajliu @jhou1

[openshift-ci]

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[jiajliu]

/lgtm

[openshift-ci]

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This pull-request has been approved by: jiajliu, JianLi-RH
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