[ExporterGeneva]Remove ConvertToJson option

src/OpenTelemetry.Exporter.Geneva/GenevaLogExporter.cs

@@ -303,9 +303,6 @@ internal int SerializeLogRecord(LogRecord logRecord)
                     case double vd:
                     case string vs:
                         break;
-                    default:
-                        value = this.convertToJson(value);
-                        break;
                 }
 
                 cursor = AddPartAField(buffer, cursor, key, value);

src/OpenTelemetry.Exporter.Geneva/GenevaTraceExporter.cs

@@ -157,9 +157,6 @@ public GenevaTraceExporter(GenevaExporterOptions options)
                 case double vd:
                 case string vs:
                     break;
-                default:
-                    value = options.ConvertToJson(value);
-                    break;
             }
 
             cursor = AddPartAField(buffer, cursor, entry.Key, value);