Fixed lack of database migration during some upgrades

TODO: add some details about when it didn't migrate.

Ticket: ENT-12045
Changelog: title

packaging/common/cfengine-hub/preinstall.sh

@@ -16,6 +16,9 @@ if is_upgrade; then
 fi
 
 # If upgrading from a version below 3.21 that has PostgreSQL, and the data dir exists.
+cf_console echo "is_upgrade is ${is_upgrade}"
+cf_console_echo "UPGRADED_FROM.txt contains: " $(cat "$PREFIX/UPGRADED_FROM.txt")
+cf_console_echo "$PREFIX/state/pg/data exists? " $(stat "$PREFIX/state/pg/data")
 if is_upgrade && egrep '^3\.([6-9]|1[0-9]|2[0-3])\.' "$PREFIX/UPGRADED_FROM.txt" >/dev/null && [ -d "$PREFIX/state/pg/data" ]; then
   alias migrating_postgres='true'
 else