update url.attribute to use appropriate attribute constant

Author: ldetmer

java-bigquery/google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/spi/v2/HttpBigQueryRpc.java

@@ -16,6 +16,7 @@
 
 package com.google.cloud.bigquery.spi.v2;
 
+import static com.google.cloud.bigquery.telemetry.BigQueryTelemetryTracer.URL_TEMPLATE;
 import static java.net.HttpURLConnection.HTTP_CREATED;
 import static java.net.HttpURLConnection.HTTP_NOT_FOUND;
 import static java.net.HttpURLConnection.HTTP_OK;
@@ -2146,9 +2147,8 @@ private Span createRpcTracingSpan(
       builder.setAllAttributes(otelAttributesFromOptions(options));
     }
 
-    // Set url.template attribute if available
     if (urlTemplate != null && !urlTemplate.isEmpty()) {
-      builder.setAttribute("url.template", urlTemplate);
+      builder.setAttribute(URL_TEMPLATE, urlTemplate);
     }
 
     return builder.startSpan();

java-bigquery/google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/telemetry/BigQueryTelemetryTracer.java

@@ -65,6 +65,8 @@ private BigQueryTelemetryTracer() {}
   public static final AttributeKey<String> SERVER_ADDRESS =
       AttributeKey.stringKey("server.address");
   public static final AttributeKey<Long> SERVER_PORT = AttributeKey.longKey("server.port");
+  public static final AttributeKey<String> URL_TEMPLATE = AttributeKey.stringKey("url.template");
+
 
   public static void addCommonAttributeToSpan(Span span) {
     span.setAttribute(GCP_CLIENT_SERVICE, BQ_GCP_CLIENT_SERVICE)

java-bigquery/google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/telemetry/HttpTracingRequestInitializer.java

@@ -39,7 +39,6 @@ public class HttpTracingRequestInitializer implements HttpRequestInitializer {
   public static final AttributeKey<String> HTTP_REQUEST_METHOD =
       AttributeKey.stringKey("http.request.method");
   public static final AttributeKey<String> URL_FULL = AttributeKey.stringKey("url.full");
-  public static final AttributeKey<String> URL_TEMPLATE = AttributeKey.stringKey("url.template");
   public static final AttributeKey<String> URL_DOMAIN = AttributeKey.stringKey("url.domain");
   public static final AttributeKey<Long> HTTP_RESPONSE_STATUS_CODE =
       AttributeKey.longKey("http.response.status_code");