fix: RCM 1149 silent drop on RDS servers (2.1.5-SAC)

Should-IgnoreEvent rejected every 1149 because ComputerName is always '-'; add persistent poll cursor, skip logging, and Diagnose on NETLOGON publish list.

Co-authored-by: Cursor <cursoragent@cursor.com>

update-rdp-monitor.ps1

@@ -34,6 +34,7 @@ $DistFiles = @(
     'Install-DomainMonitors.ps1',
     'Deploy-DomainMonitors.ps1',
     'exchange_monitor.settings.example.ps1',
+    'Diagnose-RdpLoginMonitor.ps1',
     'login_monitor.settings.example.ps1'
 )