Remove injectable constructors in metrics library

Users of the client library should be responsible for providing the bindings required. By removing the injectable constructors and named bindings in their parameters, the client library is no longer forcing its users to provide bindings with specific named annotations.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=170490834

java/google/registry/monitoring/metrics/MetricReporter.java

@@ -30,8 +30,6 @@ import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 import java.util.logging.Level;
 import java.util.logging.Logger;
-import javax.inject.Inject;
-import javax.inject.Named;
 
 /**
  * Engine to write metrics to a {@link MetricWriter} on a regular periodic basis.
@@ -57,11 +55,8 @@ public class MetricReporter extends AbstractScheduledService {
    * @param writeInterval time period between metric writes, in seconds.
    * @param threadFactory factory to use when creating background threads.
    */
-  @Inject
   public MetricReporter(
-      MetricWriter metricWriter,
-      @Named("metricsWriteInterval") long writeInterval,
-      @Named("metricsBackgroundThreadFactory") ThreadFactory threadFactory) {
+      MetricWriter metricWriter, long writeInterval, ThreadFactory threadFactory) {
     this(
         metricWriter,
         writeInterval,