Leapp utility preupgrade check reports `Old PostgreSQL data found in /var/lib/pgsql/data` inhibitor during the upgrade Red Hat Satellite 6.11 from RHEL 7.x to RHEL 8.x

Issue

Leapp reports the following inhibitor in /var/log/leapp/leapp-report.txt while upgrading Red Hat Satellite 6.11 from RHEL 7.x to RHEL 8.x:

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Risk Factor: high (inhibitor)
Title: Old PostgreSQL data found in /var/lib/pgsql/data
Summary: The upgrade wants to move PostgreSQL data to /var/lib/pgsql/data,
but this directory already exists on your system.
Please make sure /var/lib/pgsql/data doesn't exist prior to the upgrade.
Key: d10f8ee9e6bc4b73daff9c33671d1516136d53d8
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