Drop experimental from the autoconfigure property

Author: psx95

sdk-extensions/autoconfigure/src/main/java/io/opentelemetry/sdk/autoconfigure/MetricExporterConfiguration.java

@@ -90,7 +90,7 @@ static MetricReader configureReader(
             .setInternalTelemetryVersion(telemetryVersion)
             .setInterval(
                 config.getDuration("otel.metric.export.interval", DEFAULT_EXPORT_INTERVAL));
-    Integer maxExportBatchSize = config.getInt("otel.experimental.metric.export.max.batch.size");
+    Integer maxExportBatchSize = config.getInt("otel.metric.export.max.batch.size");
     if (maxExportBatchSize != null) {
       readerBuilder.setMaxExportBatchSize(maxExportBatchSize);
     }

sdk-extensions/autoconfigure/src/testFullConfig/java/io/opentelemetry/sdk/autoconfigure/MetricExporterConfigurationTest.java

@@ -124,8 +124,7 @@ void configureReader_periodicMetricReader_configured() {
     ConfigProperties config =
         DefaultConfigProperties.createFromMap(
             ImmutableMap.of(
-                "otel.metric.export.interval", "10s",
-                "otel.experimental.metric.export.max.batch.size", "200"));
+                "otel.metric.export.interval", "10s", "otel.metric.export.max.batch.size", "200"));
 
     MetricReader reader =
         MetricExporterConfiguration.configureReader(
@@ -142,7 +141,7 @@ void configureReader_periodicMetricReader_invalidMaxExportBatchSize() {
     List<Closeable> closeables = new ArrayList<>();
     ConfigProperties config =
         DefaultConfigProperties.createFromMap(
-            ImmutableMap.of("otel.experimental.metric.export.max.batch.size", "0"));
+            ImmutableMap.of("otel.metric.export.max.batch.size", "0"));
 
     assertThatThrownBy(
             () ->