(PE-39352) Add version to get peadm config (#527)

* (maint) Fix GetPEAdmConfig node group test for peadm cluster

The 'PE HA Replica' node group is present in all PE installations,
installed with or without PEADM. Switched this to check for the 'PE
Primary A' node group that a PEADM installation specifically creates.

* (PE-39352,PE-39351) Gather PE version in get_peadm_config task

Adds a lookup of the pe_build file to provide the PE version in the hash
returned by the get_peadm_config task.

We will use this in add_database and backup/restore plans as a version
gate for handling the newer host_action_collector database that is only
present in PE 2023.7+, for example.

Author: jpartlow

tasks/get_peadm_config.rb

@@ -11,9 +11,9 @@ class GetPEAdmConfig
   def initialize(params); end
 
   def execute!
-    # if there is no 'PE HA Replica' node group, it's not a peadm-configured cluster.
-    replica_group = groups.data.find { |obj| obj['name'] == 'PE HA Replica' }
-    if replica_group
+    # if there is no 'PE Primary A' node group, it's not a peadm-configured cluster.
+    peadm_primary_a_group = groups.data.find { |obj| obj['name'] == 'PE Primary A' }
+    if peadm_primary_a_group
       puts config.to_json
     else
       puts({ 'error' => 'This is not a peadm-compatible cluster. Use peadm::convert first.' }).to_json
@@ -41,6 +41,7 @@ def config
 
     # Build and return the task output
     {
+      'pe_version' => pe_version,
       'params' => {
         'primary_host' => primary,
         'replica_host' => replica,
@@ -73,6 +74,12 @@ def config
     }
   end
 
+  # @return [String] Local PE version string.
+  def pe_version
+    pe_build_file = '/opt/puppetlabs/server/pe_build'
+    File.read(pe_build_file).strip if File.exist?(pe_build_file)
+  end
+
   # Returns a GetPEAdmConfig::NodeGroups object created from the /groups object
   # returned by the classifier
   def groups