Add cluster_upgrade_SUITE
to check mixed-version upgrades (backport #11967)
#11968
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This suite uses the mixed version secondary umbrella as a starting version for a cluster and then has a helper to upgrade the cluster to the current code. This is meant to ensure that we can upgrade from the previous minor. This suite fails when downgrading Ra to 2.13.4 or 2.13.3 for example, see #11789
This is an automatic backport of pull request #11967 done by Mergify.