Update ext user account prerequisite for the new installer

Only the apache user is relevant in the containerized scenario.

Author: aneta-petrova

guides/common/modules/ref_system-requirements.adoc

@@ -58,24 +58,30 @@ ifndef::foreman-deb[]
 For more information about configuring system locale in {EL}, see {RHELDocsBaseURL}9/html/configuring_basic_system_settings/assembly_changing-basic-environment-settings_configuring-basic-system-settings#proc_configuring-the-system-locale_assembly_changing-basic-environment-settings[Configuring the system locale] in _{RHEL}{nbsp}9 Configuring basic system settings_.
 endif::[]
 
+ifndef::installer-foremanctl[]
 * If you use an external identity provider in your deployment, ensure the provider did not create the following user accounts on the system.
 These user accounts can cause conflicts with the local users that {ProductName} creates:
-** {apache-user}
+** `{apache-user}`
 ifeval::["{context}" == "{project-context}"]
-** foreman
+** `foreman`
 endif::[]
-** foreman-proxy
-** postgres
+** `foreman-proxy`
+** `postgres`
 ifdef::katello,satellite,orcharhino[]
-** pulp
+** `pulp`
 endif::[]
-** puppet
-** redis
+** `puppet`
+** `redis`
 ifdef::katello,satellite,orcharhino[]
 ifeval::["{context}" == "{project-context}"]
-** tomcat
+** `tomcat`
 endif::[]
 endif::[]
+endif::[]
+ifdef::installer-foremanctl[]
+* If you use an external identity provider in your deployment, ensure the provider did not create the `{apache-user}` user account on the system.
+This user account can cause conflicts with the local users that {ProductName} creates.
+endif::[]
 
 ifeval::["{context}" == "{smart-proxy-context}"]
 [WARNING]