Remove unused code from jaeger remote sampler (#7970)

Author: jack-berg

sdk-extensions/jaeger-remote-sampler/src/main/java/io/opentelemetry/sdk/extension/trace/jaeger/sampler/OkHttpGrpcService.java

@@ -5,7 +5,6 @@
 
 package io.opentelemetry.sdk.extension.trace.jaeger.sampler;
 
-import io.opentelemetry.exporter.internal.RetryUtil;
 import io.opentelemetry.exporter.internal.grpc.GrpcExporterUtil;
 import io.opentelemetry.exporter.sender.okhttp.internal.GrpcRequestBody;
 import io.opentelemetry.sdk.common.CompletableResultCode;
@@ -171,18 +170,6 @@ public CompletableResultCode shutdown() {
     return CompletableResultCode.ofSuccess();
   }
 
-  static boolean isRetryable(Response response) {
-    // Only retry on gRPC codes which will always come with an HTTP success
-    if (!response.isSuccessful()) {
-      return false;
-    }
-
-    // We don't check trailers for retry since retryable error codes always come with response
-    // headers, not trailers, in practice.
-    String grpcStatus = response.header(GRPC_STATUS);
-    return RetryUtil.retryableGrpcStatusCodes().contains(grpcStatus);
-  }
-
   // From grpc-java
 
   /** Unescape the provided ascii to a unicode {@link String}. */