Leapp preupgrade command is failing with error "A subscription-manager command failed to execute"

Issue

• During the leapp upgrade (RHEL7 to RHEL 8) activity, leapp preupgrade command is failing with error "A subscription-manager command failed to execute."

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                           ERRORS
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2023-11-13 01:04:26.424695 [ERROR] Actor: scan_subscription_manager_info
Message: A subscription-manager command failed to execute
Summary:
    Details: Command ['subscription-manager', 'list', '--consumed'] failed with exit code 1.
    Stderr: Traceback (most recent call last):
              File "/sbin/subscription-manager", line 9, in <module>
                load_entry_point('subscription-manager==1.24.52', 'console_scripts', 'subscription-manager')()
              File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 378, in load_entry_point
                return get_distribution(dist).load_entry_point(group, name)
              File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2566, in load_entry_point
                return ep.load()
              File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2260, in load
                entry = __import__(self.module_name, globals(),globals(), ['__name__'])
              File "/usr/lib64/python2.7/site-packages/subscription_manager/scripts/subscription_manager.py", line 68, in <module>
                inj.require(inj.DBUS_IFACE)
              File "/usr/lib64/python2.7/site-packages/subscription_manager/injection.py", line 109, in require
                return FEATURES.require(feature, *args, **kwargs)
              File "/usr/lib64/python2.7/site-packages/subscription_manager/injection.py", line 80, in require
                raise KeyError("Unknown feature: %r" % feature)
            KeyError: "Unknown feature: 'DBUS_IFACE'"
    Hint: Please ensure you have a valid RHEL subscription and your network is up. If you are using proxy for Red Hat subscription-manager, please make sure it is specified inside the /etc/rhsm/rhsm.conf file. Or use the --no-rhsm option when running leapp, if you do not want to use subscription-manager for the in-place upgrade and you want to deliver all target repositories by yourself or using RHUI on public cloud.

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