[networkmanager] Declare NetworkManager in the services tuple

[suraj-cmd]

setup() calls add_journal() for the NetworkManager unit but the plugin
declares no services tuple and never collects the service status. An
sosreport from a host with a networking problem therefore contains the journal
but nothing showing whether the daemon is enabled, running, or failing to
start.

Plugin._collect_services() runs each entry of the tuple through
is_service() and calls both add_service_status() and add_journal(), so
declaring the unit adds the missing status and replaces the explicit call.

It also gives the plugin an enablement trigger beyond the package name. The
package differs between distributions — NetworkManager on Red Hat,
network-manager on Debian and Ubuntu — while the unit is NetworkManager on
both.

Follows @TurboTurtle's review comment on #4429, and the same change made in
#4436 and #4437.

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[suraj-cmd]

Tested on RHEL 10 (aarch64), NetworkManager running as shipped.

Before, on main:

# ls /var/tmp/sosreport-localhost-2026-08-11-kjirjnz/sos_commands/networkmanager/
journalctl_--no-pager_--unit_NetworkManager
NetworkManager_--print-config
nmcli_con
nmcli_con_show_--active
nmcli_con_show_id_enp0s1
nmcli_con_show_id_lo
nmcli_dev
nmcli_dev_show_enp0s1
nmcli_dev_show_lo
nmcli_-f_all_con
nmcli_general_status

After, with this change:

# ls /var/tmp/sosreport-localhost-2026-08-11-gzzpsyy/sos_commands/networkmanager/
journalctl_--no-pager_--unit_NetworkManager
NetworkManager_--print-config
nmcli_con
nmcli_con_show_--active
nmcli_con_show_id_enp0s1
nmcli_con_show_id_lo
nmcli_dev
nmcli_dev_show_enp0s1
nmcli_dev_show_lo
nmcli_-f_all_con
nmcli_general_status
systemctl_status_NetworkManager

The journal is still collected, now via the services tuple rather than the
explicit call; the service status is new.

[packit-as-a-service]

Congratulations! One of the builds has completed. 🍾

You can install the built RPMs by following these steps:

• sudo dnf install -y 'dnf*-command(copr)'
• dnf copr enable packit/sosreport-sos-4438
• And now you can install the packages.

Please note that the RPMs should be used only in a testing environment.