fix: load ::common::monitor::prometheus::server and ::common::monitor::exporter from common::monitor::prometheus class, so node_exporter does not fail with wierd error

```
Error: Could not retrieve catalog from remote server: Error 500 on SERVER: Server Error: Evaluation Error: Error while evaluating a Resource Statement, Class[Prometheus]:
  expects a value for parameter env_file_path
  parameter init_style expects a match for Prometheus::Initstyle = Enum[launchd, none, sles, systemd, sysv, upstart], got init (file: /etc/puppetlabs/code/environments/arm64_support/modules/enableit/common/manifests/monitor/exporter/node.pp, line: 167, column: 3) on node
```

Author: ashish1099

modules/enableit/common/manifests/monitor.pp

@@ -8,7 +8,6 @@
 ) {
   if $enable {
     contain ::monitor
-    contain ::common::monitor::exporter
-    contain ::common::monitor::prometheus::server
+    contain ::common::monitor::prometheus
   }
 }

modules/enableit/common/manifests/monitor/prometheus.pp

@@ -54,4 +54,7 @@
     env_file_path     => $env_file_path,
     init_style        => $_init_style,
   }
+
+  include common::monitor::prometheus::server
+  include common::monitor::exporter
 }

modules/enableit/common/manifests/monitor/prometheus/server.pp

@@ -20,8 +20,6 @@
   Eit_types::Noop_Value $noop_value = $common::monitor::noop_value,
 ) {
 
-  include common::monitor::prometheus
-
   Exec {
     noop => $noop_value,
   }