Fix EditorWorkspaceTests for IEnumerable Documents

Agent-Logs-Url: https://github.com/PowerShell/PowerShellEditorServices/sessions/2e354cc4-b0b9-4177-8ac1-8826e0921553

Co-authored-by: JustinGrote <15258962+JustinGrote@users.noreply.github.com>

Author: Copilot

test/PowerShellEditorServices.Test/Extensions/EditorWorkspaceTests.cs

@@ -27,7 +27,7 @@ public void DocumentsReturnsOpenWorkspaceDocuments()
 
             EditorWorkspace workspace = new(editorOperations);
 
-            EditorWorkspaceDocument[] documents = workspace.Documents;
+            IEnumerable<EditorWorkspaceDocument> documents = workspace.Documents;
 
             Assert.Collection(
                 documents,
@@ -81,7 +81,7 @@ public void DocumentToStringReturnsFileNameAndSavedStatus()
             };
 
             EditorWorkspace workspace = new(editorOperations);
-            EditorWorkspaceDocument[] documents = workspace.Documents;
+            IEnumerable<EditorWorkspaceDocument> documents = workspace.Documents;
 
             Assert.Collection(
                 documents,
@@ -102,7 +102,7 @@ public void DocumentSavedReturnsWorkspaceSavedState()
             };
 
             EditorWorkspace workspace = new(editorOperations);
-            EditorWorkspaceDocument[] documents = workspace.Documents;
+            IEnumerable<EditorWorkspaceDocument> documents = workspace.Documents;
 
             Assert.Collection(
                 documents,