Rename MarkDown -> Markdown to resolve differences for non-Windows machines (#3758)

src/modules/previewpane/MarkdownPreviewHandler/Telemetry/Events/MarkdownFileHandlerLoaded.cs

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+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Diagnostics.Tracing;
+using Microsoft.PowerToys.Telemetry;
+using Microsoft.PowerToys.Telemetry.Events;
+
+namespace MarkdownPreviewHandler.Telemetry.Events
+{
+    /// <summary>
+    /// A telemetry event that is triggered when a markdown file is viewed in the preview pane.
+    /// </summary>
+    [EventData]
+    public class MarkdownFileHandlerLoaded : EventBase, IEvent
+    {
+        /// <summary>
+        /// Gets The version string. TODO: This should be replaced by a P/Invoke call to get_product_version.
+        /// </summary>
+        public string Version => "v0.19.2";
+
+        /// <inheritdoc/>
+        public PartA_PrivTags PartA_PrivTags => PartA_PrivTags.ProductAndServiceUsage;
+    }
+}

src/modules/previewpane/MarkdownPreviewHandler/Telemetry/Events/MarkdownFilePreviewError.cs

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+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.PowerToys.Telemetry;
+using Microsoft.PowerToys.Telemetry.Events;
+
+namespace MarkdownPreviewHandler.Telemetry.Events
+{
+    /// <summary>
+    /// A telemetry event that is triggered when an error occurs while attempting to view a markdown file in the preview pane.
+    /// </summary>
+    public class MarkdownFilePreviewError : EventBase, IEvent
+    {
+        /// <summary>
+        /// Gets or sets the error message.
+        /// </summary>
+        public string Message { get; set; }
+
+        /// <inheritdoc/>
+        public PartA_PrivTags PartA_PrivTags => PartA_PrivTags.ProductAndServicePerformance;
+    }
+}

src/modules/previewpane/MarkdownPreviewHandler/Telemetry/Events/MarkdownFilePreviewed.cs

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+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Diagnostics.Tracing;
+using Microsoft.PowerToys.Telemetry;
+using Microsoft.PowerToys.Telemetry.Events;
+
+namespace MarkdownPreviewHandler.Telemetry.Events
+{
+    /// <summary>
+    /// A telemetry event that is triggered when a markdown file is viewed in the preview pane.
+    /// </summary>
+    [EventData]
+    public class MarkdownFilePreviewed : EventBase, IEvent
+    {
+        /// <inheritdoc/>
+        public PartA_PrivTags PartA_PrivTags => PartA_PrivTags.ProductAndServiceUsage;
+    }
+}