logging_services_active: add syslog-ng as a recognized logging service

[israel-villar]

The OVAL check and description only listed rsyslog and systemd-journald. Add syslog-ng to the unit pattern so the rule passes on systems that use syslog-ng as their primary logging daemon (e.g. Debian 13 CIS profile).

Description:

• Add syslog-ng to the systemd unit pattern in the logging_services_active
  OVAL check and to the example command in the rule description.

• Previously the rule only recognized rsyslog and systemd-journald as
  valid active logging services. Systems that use syslog-ng as their primary
  logging daemon (e.g. Debian 13 with the CIS profile) would fail this check
  even when a logging service is correctly active.

Rationale:

• syslog-ng is a widely-used alternative to rsyslog. The rule intent is
  "at least one logging service is active", so syslog-ng should be included
  alongside rsyslog and systemd-journald.

Review Hints:

• Two-line change: one in the OVAL unit pattern, one in the description example.

[openshift-ci]

Hi @israel-villar. Thanks for your PR.

I'm waiting for a ComplianceAsCode member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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