Apply Resharper hint: pass string interpolation

Author: bkoelman

src/Examples/JsonApiDotNetCoreExample/appsettings.json

@@ -9,7 +9,7 @@
       "Microsoft.EntityFrameworkCore.Update": "Critical",
       "Microsoft.EntityFrameworkCore.Database.Command": "Critical",
       "JsonApiDotNetCore.Middleware.JsonApiMiddleware": "Information",
-      "Program": "Information"
+      "JsonApiDotNetCoreExample": "Information"
     }
   },
   "AllowedHosts": "*"

src/JsonApiDotNetCore/Diagnostics/CascadingCodeTimer.cs

@@ -238,12 +238,12 @@ private void WriteResult(StringBuilder builder, int indent, TimeSpan timeElapsed
             WriteIndent(builder, indent);
             builder.Append(Name);
             WritePadding(builder, indent, paddingLength);
-            builder.AppendFormat(CultureInfo.InvariantCulture, "{0,19:G}", timeElapsedInSelf);
+            builder.Append(CultureInfo.InvariantCulture, $"{timeElapsedInSelf,19:G}");
 
             if (!_excludeInRelativeCost)
             {
                 builder.Append(" ... ");
-                builder.AppendFormat(CultureInfo.InvariantCulture, "{0,7:#0.00%}", scaleElapsedInSelf);
+                builder.Append(CultureInfo.InvariantCulture, $"{scaleElapsedInSelf,7:#0.00%}");
             }
 
             if (_stoppedAt == null)