chore: fix built in client metric data (googleapis#3415)

This PR fixes the below issues for client metrics.

- Use correct project id instead of defaultProjectId
- Sets a default value for directpath_enabled attribute 
- Use map overload for addAttributes in compositeTracer

google-cloud-spanner/src/main/java/com/google/cloud/spanner/BuiltInOpenTelemetryMetricsProvider.java

@@ -20,6 +20,7 @@
 import static com.google.cloud.spanner.BuiltInMetricsConstant.CLIENT_HASH_KEY;
 import static com.google.cloud.spanner.BuiltInMetricsConstant.CLIENT_NAME_KEY;
 import static com.google.cloud.spanner.BuiltInMetricsConstant.CLIENT_UID_KEY;
+import static com.google.cloud.spanner.BuiltInMetricsConstant.DIRECT_PATH_ENABLED_KEY;
 import static com.google.cloud.spanner.BuiltInMetricsConstant.INSTANCE_CONFIG_ID_KEY;
 import static com.google.cloud.spanner.BuiltInMetricsConstant.LOCATION_ID_KEY;
 import static com.google.cloud.spanner.BuiltInMetricsConstant.PROJECT_ID_KEY;
@@ -83,6 +84,7 @@ Map<String, String> createClientAttributes(String projectId, String client_name)
     clientAttributes.put(LOCATION_ID_KEY.getKey(), detectClientLocation());
     clientAttributes.put(PROJECT_ID_KEY.getKey(), projectId);
     // TODO: Replace this with real value.
+    clientAttributes.put(DIRECT_PATH_ENABLED_KEY.getKey(), "false");
     clientAttributes.put(INSTANCE_CONFIG_ID_KEY.getKey(), "unknown");
     clientAttributes.put(CLIENT_NAME_KEY.getKey(), client_name);
     String clientUid = getDefaultTaskValue();

google-cloud-spanner/src/main/java/com/google/cloud/spanner/CompositeTracer.java

@@ -184,7 +184,7 @@ public void addAttributes(Map<String, String> attributes) {
     for (ApiTracer child : children) {
       if (child instanceof MetricsTracer) {
         MetricsTracer metricsTracer = (MetricsTracer) child;
-        attributes.forEach((key, value) -> metricsTracer.addAttributes(key, value));
+        metricsTracer.addAttributes(attributes);
       }
     }
   }

google-cloud-spanner/src/main/java/com/google/cloud/spanner/SpannerOptions.java

@@ -1726,14 +1726,13 @@ private ApiTracerFactory getDefaultApiTracerFactory() {
   private ApiTracerFactory createMetricsApiTracerFactory() {
     OpenTelemetry openTelemetry =
         this.builtInOpenTelemetryMetricsProvider.getOrCreateOpenTelemetry(
-            getDefaultProjectId(), getCredentials());
+            this.getProjectId(), getCredentials());
 
     return openTelemetry != null
         ? new MetricsTracerFactory(
             new OpenTelemetryMetricsRecorder(openTelemetry, BuiltInMetricsConstant.METER_NAME),
             builtInOpenTelemetryMetricsProvider.createClientAttributes(
-                getDefaultProjectId(),
-                "spanner-java/" + GaxProperties.getLibraryVersion(getClass())))
+                this.getProjectId(), "spanner-java/" + GaxProperties.getLibraryVersion(getClass())))
         : null;
   }
 

google-cloud-spanner/src/test/java/com/google/cloud/spanner/OpenTelemetryBuiltInMetricsTracerTest.java

@@ -94,6 +94,7 @@ public static void setup() {
         Attributes.builder()
             .put(BuiltInMetricsConstant.PROJECT_ID_KEY, "test-project")
             .put(BuiltInMetricsConstant.INSTANCE_CONFIG_ID_KEY, "unknown")
+            .put(BuiltInMetricsConstant.DIRECT_PATH_ENABLED_KEY, "false")
             .put(
                 BuiltInMetricsConstant.LOCATION_ID_KEY,
                 BuiltInOpenTelemetryMetricsProvider.detectClientLocation())