Log exceptions observed during up-to-date checks

Previously any exception seen during the up-to-date check would result in a build being scheduled, but no information being provided as to why that would happen.

By logging a message when an exception occurs, users can more easily make progress diagnosing the issue.

We also publish an "Exception" reason via telemetry, so we will be able to see how widespread such problems are.

src/Microsoft.VisualStudio.ProjectSystem.Managed/ProjectSystem/UpToDate/BuildUpToDateCheck.cs

@@ -720,6 +720,10 @@ async Task<bool> IsUpToDateInternalAsync(UpToDateCheckConfiguredInput state, Dat
                     logger.UpToDate();
                     return true;
                 }
+                catch (Exception ex)
+                {
+                    return logger.Fail("Exception", "Up-to-date check threw an exception. Not up-to-date. {0}", ex);
+                }
                 finally
                 {
                     logger.Verbose("Up to date check completed in {0:N1} ms", sw.Elapsed.TotalMilliseconds);