Strip legacy UI and keep headless runtime

Headless/IntuneManagement.Headless.psm1

@@ -71,11 +71,11 @@ function Invoke-IntuneHeadlessBatch
     Test-AuthParameters -Secret $Secret -Certificate $Certificate
 
     $projectRoot = Get-IntuneManagementProjectRoot
-    $startScript = Join-Path $projectRoot "Start-IntuneManagement.ps1"
+    $runtimeModule = Join-Path $projectRoot "Runtime/IntuneManagement.Runtime.psd1"
 
-    if(-not (Test-Path $startScript))
+    if(-not (Test-Path $runtimeModule))
     {
-        throw "Could not find Start-IntuneManagement.ps1 in $projectRoot"
+        throw "Could not find IntuneManagement.Runtime.psd1 in $projectRoot"
     }
 
     $settingsPath = Resolve-HeadlessSettingsPath $SettingsFile
@@ -109,7 +109,8 @@ function Invoke-IntuneHeadlessBatch
             $invokeParams.Certificate = $Certificate
         }
 
-        & $startScript @invokeParams
+        Import-Module $runtimeModule -Force
+        Initialize-IntuneManagementRuntime -View "IntuneGraphAPI" @invokeParams
     }
     finally
     {