ncm-spma: dnf backend not honouring whitelisted packages.

[aka7]

packages listed in '/software/components/spma/whitelist' are not being retained by spma, these are still getting removed.
spma backend being used is 'dnf'.

• The version of the component you are using (rpm -q $component)
  ncm-spma-23.6.0-1.noarch

• What OS version you are using (/etc/redhat-release or similar)
  $ cat /etc/redhat-release
  Red Hat Enterprise Linux release 8.10 (Ootpa)

• Steps required to reproduce the problem
  add a package in whitelist path, which is not in spma install list or in dependency list.

• Actual result versus expected result
  packages in whitelist should be ignored by spma but currently being removed.