Add 18.x upgrade stops to upgrade path SSoT

Clemens Beckrequested to merge
cb-18-x-stops into master

What does this MR do and why?

Add 18.x upgrade stops to upgrade path SSoT

Add the planned 18.x upgrade stops to the SSoT. This is used as SSoT by release tools to apply upgrade stops to Omnibus and the GitLab Helm chart.

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