qa/suites/upgrade: update upgrade paths

qa/suites/upgrade: update upgrade paths

Reef is EOL, so it should be removed from the upgrade
paths. Upgrade paths only go as far back as two releases,
and since the last two releases are Tentacle and Squid,
Reef is outside of this "N-2" schema.

Since Squid and Tentacle are the latest stable releases
if we look back from "main", then we need to make sure to
add Tentacle to the upgrade paths.

This modification is prompted by the fact that we can't
test upgrade paths from Reef to Main on Rocky10 packages.
But this change should happen regardless.

Fixes: https://tracker.ceph.com/issues/74609
Signed-off-by: Laura Flores <lflores@ibm.com>