assembly: add assemblyutils

The implementation of TRACE2 tracing will require use of the
TryGetAssemblyVersion method. To prepare for this, move this method out
of the DiagnoseCommand class and into its own static class.

Author: Lessley Dennington

src/shared/Core/AssemblyUtils.cs

@@ -0,0 +1,24 @@
+using System.Reflection;
+
+namespace GitCredentialManager;
+
+public static class AssemblyUtils
+{
+    public static bool TryGetAssemblyVersion(out string version)
+    {
+        try
+        {
+            var assembly = Assembly.GetEntryAssembly() ?? Assembly.GetExecutingAssembly();
+            var assemblyVersionAttribute = assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>();
+            version = assemblyVersionAttribute is null
+                ? assembly.GetName().Version.ToString()
+                : assemblyVersionAttribute.InformationalVersion;
+            return true;
+        }
+        catch
+        {
+            version = null;
+            return false;
+        }
+    }
+}

src/shared/Core/Commands/DiagnoseCommand.cs

@@ -86,7 +86,7 @@ private async Task<int> ExecuteAsync(string output)
             fullLog.WriteLine($"AppPath: {_context.ApplicationPath}");
             fullLog.WriteLine($"InstallDir: {_context.InstallationDirectory}");
             fullLog.WriteLine(
-                TryGetAssemblyVersion(out string version)
+                AssemblyUtils.TryGetAssemblyVersion(out string version)
                     ? $"Version: {version}"
                     : "Version: [!] Failed to get version information [!]"
             );
@@ -198,24 +198,6 @@ private async Task<int> ExecuteAsync(string output)
             return numFailed;
         }
 
-        private bool TryGetAssemblyVersion(out string version)
-        {
-            try
-            {
-                var assembly = Assembly.GetEntryAssembly() ?? Assembly.GetExecutingAssembly();
-                var assemblyVersionAttribute = assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>();
-                version = assemblyVersionAttribute is null
-                    ? assembly.GetName().Version.ToString()
-                    : assemblyVersionAttribute.InformationalVersion;
-                return true;
-            }
-            catch
-            {
-                version = null;
-                return false;
-            }
-        }
-
         private static class ConsoleEx
         {
             public static void WriteLineIndent(string str)