Update logging methods to use standard naming conventions

Replaced custom Warn method with LogWarning in Logger class and updated usage in FinalizeDocumentJob. Added LogInformation and LogWarning methods for consistency with common logging practices. LogWarning now accepts an Exception as the first parameter, aligning with standard logging signatures.

EnvelopeGenerator.ServiceHost/Jobs/FinalizeDocumentJob.cs

@@ -196,7 +196,7 @@ public class FinalizeDocumentJob(IOptions<WorkerOptions> options, IConfiguration
                 catch (Exception ex)
                 {
                     _logger.Error(ex);
-                    _logger.Warn(ex, "Unhandled exception while working envelope [{0}]", id);
+                    _logger.LogWarning(ex, "Unhandled exception while working envelope [{0}]", id);
                 }
 
                 current += 1;