Do NOT add OCP variant to custom config names

[mgencur]

I have spoken with INTEROP team and they rely on some automation and processes that need certain naming conventions.

• Change lp-rosa-classic to ocp4.17-lp-rosa-classic
• As part of this change - prevent adding the OpenShift variant to the custom config name. It makes sense to hard code the name of the file/variant, i.e. take it directly from the config name. The custom configs often include OCP-specific configuration elements so they're bound to certain OCP version anyway.

[ReToCode]

/lgtm
/approve

[openshift-ci]

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