[release/8.0-staging] [DNS] Ignore ObjectDisposedException on CancellationToken Callback (#115841)

* Ignore ObjectDisposedException on CancellationToken Callback

* Update src/libraries/System.Net.NameResolution/src/System/Net/NameResolutionPal.Windows.cs

Co-authored-by: Jan Kotas <jkotas@microsoft.com>

* Change wording in comment

* Update src/libraries/System.Net.NameResolution/src/System/Net/NameResolutionPal.Windows.cs

---------

Co-authored-by: Ahmet Ibrahim Aksoy <aaksoy@microsoft.com>
Co-authored-by: Jan Kotas <jkotas@microsoft.com>

Author: 3 people

src/libraries/System.Net.NameResolution/src/System/Net/NameResolutionPal.Windows.cs

@@ -437,6 +437,11 @@ public void RegisterForCancellation(CancellationToken cancellationToken)
                             NetEventSource.Info(@this, $"GetAddrInfoExCancel returned error {cancelResult}");
                         }
                     }
+                    catch (ObjectDisposedException)
+                    {
+                        // There is a race between checking @this._completed and @this.DangerousAddRef and disposing from another thread.
+                        // We lost the race. No further action needed.
+                    }
                     finally
                     {
                         if (needRelease)