fix: Reinstate max number of log files. (#1930)

Author: chynesNR

src/Agent/NewRelic/Agent/Core/Logging/LoggerBootstrapper.cs

@@ -253,7 +253,7 @@ private static LoggerConfiguration ConfigureRollingLogSink(this LoggerConfigurat
                             fileSizeLimitBytes: 50 * 1024 * 1024,
                             encoding: Encoding.UTF8,
                             rollOnFileSizeLimit: true,
-                            retainedFileCountLimit: null, // unlimited number of files
+                            retainedFileCountLimit: 4, // TODO: Will make configurable
                             shared: true,
                             buffered: false
                             );