chore: ensure EventProcessor::OnEndValidationStage is called when critical validation contained

Author: filzrev

src/BenchmarkDotNet/Running/BenchmarkRunnerClean.cs

@@ -71,11 +71,11 @@ internal static Summary[] Run(BenchmarkRunInfo[] benchmarkRunInfos)
 
                 PrintValidationErrors(compositeLogger, validationErrors);
 
+                eventProcessor.OnEndValidationStage(); // Ensure that OnEndValidationStage() is called when a critical validation error exists.
+
                 if (validationErrors.Any(validationError => validationError.IsCritical))
                     return new[] { Summary.ValidationFailed(title, resultsFolderPath, logFilePath, validationErrors.ToImmutableArray()) };
 
-                eventProcessor.OnEndValidationStage();
-
                 int totalBenchmarkCount = supportedBenchmarks.Sum(benchmarkInfo => benchmarkInfo.BenchmarksCases.Length);
                 int benchmarksToRunCount = totalBenchmarkCount - (idToResume + 1); // ids are indexed from 0
                 compositeLogger.WriteLineHeader("// ***** BenchmarkRunner: Start   *****");