Use runspace to acquire version to avoid CLM issues (#1869)

Author: adityapatwardhan

src/code/InternalHooks.cs

@@ -22,5 +22,10 @@ public static void SetTestHook(string property, object value)
             var fieldInfo = typeof(InternalHooks).GetField(property, BindingFlags.Static | BindingFlags.NonPublic);
             fieldInfo?.SetValue(null, value);
         }
+
+        public static string GetUserString()
+        {
+            return Microsoft.PowerShell.PSResourceGet.Cmdlets.UserAgentInfo.UserAgentString();
+        }
     }
-}
+}

src/code/ServerFactory.cs

@@ -12,11 +12,7 @@ internal static class UserAgentInfo
     {
         static UserAgentInfo()
         {
-            using (System.Management.Automation.PowerShell ps = System.Management.Automation.PowerShell.Create(RunspaceMode.CurrentRunspace))
-            {
-                _psVersion = ps.AddScript("$PSVersionTable").Invoke<Hashtable>()[0]["PSVersion"].ToString();
-            }
-
+            _psVersion = System.Management.Automation.Runspaces.Runspace.DefaultRunspace.Version.ToString();
             _psResourceGetVersion = typeof(UserAgentInfo).Assembly.GetName().Version.ToString();
             _distributionChannel = System.Environment.GetEnvironmentVariable("POWERSHELL_DISTRIBUTION_CHANNEL") ?? "unknown";
         }

test/ConstrainedLanguageMode.Tests.ps1

@@ -0,0 +1,10 @@
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+
+# In future, we will add more tests to be executed in Constrained Language Mode.
+Describe "Test UserAgentInfo" {
+    It "GetUserString returns a non-null, non-empty string" {
+        $userAgentString = [Microsoft.PowerShell.PSResourceGet.InternalHooks]::GetUserString()
+        $userAgentString | Should -Not -BeNullOrEmpty
+    }
+}