move kitchensink upgrade to ocp 4.20

[maschmid]

As the kitchensink-upgrade is broken on OCP 4.21 due to https://redhat.atlassian.net/browse/SRVKE-1817 (kitchensink upgrade starts with installing 1.35, which breaks on OCP 4.21 due to that issue only fixed in 1.37) , the easiest fix is to run the kitchensink-upgrade on OCP 4.20

Adding a few fields to make it possible:

• skipE2EMatches / includeE2EMatches on the OpenShift version level to include/exclude specific e2e matches (reuses the mechanism that existed already for branches)
• skipPromotion on the OpenShift version to skip being considered for the name/tag promotion, so that this addition of OCP 4.20 does not change the existing promotion.

Assisted-by: Claude Opus 4.6

[dsimansk]

/approve
/lgtm

[openshift-ci]

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