Temp/15591 serilog string conventions (#15592)

* Updaets `MigrationPlanExecutor.cs` to use serilog convention for strings

* Updaets `ExamineManagementController.cs` to use serilog convention for strings

* Updaets `HelpController.cs` to use serilog convention for strings

* Updaets `PreviewAuthenticationMiddleware.cs` to use serilog convention for strings

Author: liamlaverty

src/Umbraco.Infrastructure/Migrations/MigrationPlanExecutor.cs

@@ -127,7 +127,7 @@ private void HandlePostMigrations(ExecutedMigrationPlan result)
                         continue;
                     }
 
-                    _logger.LogInformation($"PostMigration: {migrationContextPostMigration.FullName}.");
+                    _logger.LogInformation("PostMigration: {migrationContextFullName}.", migrationContextPostMigration.FullName);
                     MigrationBase postMigration = _migrationBuilder.Build(migrationContextPostMigration, executedMigrationContext);
                     postMigration.Run();
 

src/Umbraco.Web.BackOffice/Controllers/ExamineManagementController.cs

@@ -306,7 +306,7 @@ private void Indexer_IndexOperationComplete(object? sender, EventArgs e)
             indexer.IndexOperationComplete -= Indexer_IndexOperationComplete;
         }
 
-        _logger.LogInformation($"Rebuilding index '{indexer?.Name}' done.");
+        _logger.LogInformation("Rebuilding index '{indexerName}' done.", indexer?.Name);
 
         var cacheKey = "temp_indexing_op_" + indexer?.Name;
         _runtimeCache.Clear(cacheKey);

src/Umbraco.Web.BackOffice/Controllers/HelpController.cs

@@ -66,7 +66,7 @@ public async Task<List<HelpPage>> GetContextHelpForPage(string section, string t
         }
         catch (HttpRequestException rex)
         {
-            _logger.LogInformation($"Check your network connection, exception: {rex.Message}");
+            _logger.LogInformation("Check your network connection, exception: {message}", rex.Message);
         }
 
         return new List<HelpPage>();

src/Umbraco.Web.Common/Middleware/PreviewAuthenticationMiddleware.cs

@@ -75,7 +75,7 @@ public async Task InvokeAsync(HttpContext context, RequestDelegate next)
         catch (Exception ex)
         {
             // log any errors and continue the request without preview
-            _logger.LogError($"Unable to perform preview authentication: {ex.Message}");
+            _logger.LogError("Unable to perform preview authentication: {message}", ex.Message);
         }
         finally
         {