Update usage of IAsyncLifetime.DisposeAsync to pair with InitializeAsync

src/VisualStudio/IntegrationTest/IntegrationTests/AbstractIntegrationTest.cs

@@ -61,8 +61,14 @@ public virtual async Task InitializeAsync()
             }
         }
 
-        public Task DisposeAsync()
+        /// <summary>
+        /// This method implements <see cref="IAsyncLifetime.DisposeAsync"/>, and is used for releasing resources
+        /// created by <see cref="IAsyncLifetime.InitializeAsync"/>. This method is only called if
+        /// <see cref="InitializeAsync"/> completes successfully.
+        /// </summary>
+        public virtual Task DisposeAsync()
         {
+            _visualStudioContext.Dispose();
             return Task.CompletedTask;
         }
 
@@ -81,18 +87,17 @@ protected void Wait(double seconds)
             Thread.Sleep(timeout);
         }
 
+        /// <summary>
+        /// This method provides the implementation for <see cref="IDisposable.Dispose"/>. This method via the
+        /// <see cref="IDisposable"/> interface (i.e. <paramref name="disposing"/> is <see langword="true"/>) if the
+        /// constructor completes successfully. The <see cref="InitializeAsync"/> may or may not have completed
+        /// successfully.
+        /// </summary>
         protected virtual void Dispose(bool disposing)
         {
             if (disposing)
             {
-                try
-                {
-                    _visualStudioContext?.Dispose();
-                }
-                finally
-                {
-                    _messageFilter.Dispose();
-                }
+                _messageFilter.Dispose();
             }
         }
 

src/VisualStudio/IntegrationTest/IntegrationTests/CSharp/CSharpInteractiveBoxSelection.cs

@@ -22,19 +22,10 @@ public override async Task InitializeAsync()
             VisualStudio.InteractiveWindow.SubmitText("#cls");
         }
 
-        protected override void Dispose(bool disposing)
+        public override Task DisposeAsync()
         {
-            try
-            {
-                if (disposing && VisualStudio != null)
-                {
-                    VisualStudio.ExecuteCommand(WellKnownCommandNames.Edit_SelectionCancel);
-                }
-            }
-            finally
-            {
-                base.Dispose(disposing);
-            }
+            VisualStudio.ExecuteCommand(WellKnownCommandNames.Edit_SelectionCancel);
+            return base.DisposeAsync();
         }
 
         [WpfFact]

src/VisualStudio/IntegrationTest/IntegrationTests/CSharp/CSharpReplIdeFeatures.cs

@@ -22,21 +22,12 @@ public override async Task InitializeAsync()
             VisualStudio.Workspace.SetUseSuggestionMode(true);
         }
 
-        protected override void Dispose(bool disposing)
-        {
-            try
-            {
-                if (disposing && VisualStudio != null)
-                {
-                    VisualStudio.Workspace.SetUseSuggestionMode(false);
-                    VisualStudio.InteractiveWindow.ClearReplText();
-                    VisualStudio.InteractiveWindow.Reset();
-                }
-            }
-            finally
-            {
-                base.Dispose(disposing);
-            }
+        public override Task DisposeAsync()
+        {
+            VisualStudio.Workspace.SetUseSuggestionMode(false);
+            VisualStudio.InteractiveWindow.ClearReplText();
+            VisualStudio.InteractiveWindow.Reset();
+            return base.DisposeAsync();
         }
 
         [WpfFact]